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example, how
CUMULATIVE GAINS AND LIFT CURVES: MEASURING THE The dashed line in Figure 2 corresponds with “no gain”, i.e., what we would expect to achieve by contacting customers at random. The closer the cumulative gains line is to the top-left corner of the chart, the greater the gain; the higher the proportion of the responders that are reached for the lower proportion of customerscontacted.
THE IMPORTANCE AND EFFECT OF SAMPLE SIZE THE IMPORTANCE OF PROBABILITY IN LAW The Importance of Probability in Law. written by Steve Brooks. published on Tue, 22/10/2013. The second joint ExIStA and RSS South West Local Group seminar took place on the 11 th October with invited speaker Norman Fenton, Director of Risk and Information Management Research at Queen Mary University of London and CEO of Agena Ltd . HOME - SELECT STATISTICAL CONSULTANTSABOUT USSECTORSSERVICESRESOURCESCONTACT USCASE STUDIES Energy Saving Trust. Select are expert in applying statistical techniques to real-World commercial situations. They turn complex statistical ideas into simple, straightforward advice, making them an invaluable partner in developing our products and growing POPULATION PROPORTION Formula. This calculator uses the following formula for the sample size n: n = N*X / (X + N – 1), where, X = Z α/22 *p* (1-p) / MOE 2, and Z α/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), MOE is the margin of error, p is the sample proportion COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? published on Wed, 25/11/2020. In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showing surprisingly good results. Pfizer and BioNTech announced their vaccine candidate was found to be more than 90% effective and less than a week later Moderna announced that their COMPARING TWO PROPORTIONS ASSESSING QUESTIONNAIRE VALIDITY Criterion validity is the extent to which the measures derived from the survey relate to other external criteria. These external criteria can either be concurrent or predictive. Concurrent validity criteria are measured at the same time as the survey, either with questions embedded within the survey, or measures obtained from other sources. WHAT IS R AND WHY SHOULD YOU USE IT? Well, R is designed specifically for statistical computing and graphics. It is free and open source, the latter meaning that anyone can interrogate the code to see what’s going on – there’s no black box involved. R provides a flexible analysis toolkit where all of the standard statistical techniques are built-in. ASSESSING QUESTIONNAIRE RELIABILITY Assessing Questionnaire Reliability. Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customer insight/satisfaction, product preferences in market research. We invariably use surveys because we want to measure something, forexample, how
CUMULATIVE GAINS AND LIFT CURVES: MEASURING THE The dashed line in Figure 2 corresponds with “no gain”, i.e., what we would expect to achieve by contacting customers at random. The closer the cumulative gains line is to the top-left corner of the chart, the greater the gain; the higher the proportion of the responders that are reached for the lower proportion of customerscontacted.
THE IMPORTANCE AND EFFECT OF SAMPLE SIZE THE IMPORTANCE OF PROBABILITY IN LAW The Importance of Probability in Law. written by Steve Brooks. published on Tue, 22/10/2013. The second joint ExIStA and RSS South West Local Group seminar took place on the 11 th October with invited speaker Norman Fenton, Director of Risk and Information Management Research at Queen Mary University of London and CEO of Agena Ltd . MEET OUR CONSULTANTS The freelance consultants we use are leaders in their field and each specialises in a particular area. However large, specific or unusual your statistical challenge might be, we have the skills and experience you need. All project work is co-ordinated and managed by Select to ensure consistently high standards of communication and customerservice.
CALCULATORS
We’ve put together some free, online statistical calculators to help you carry out some basic statistical calculations of your own. We’ve chosen to put together some calculators for the types of analysis that we commonly undertake for our clients. Over time we’ll be adding to these online calculators to include other types of statisticalcalculations
COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? published on Wed, 25/11/2020. In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showing surprisingly good results. Pfizer and BioNTech announced their vaccine candidate was found to be more than 90% effective and less than a week later Moderna announced that their ODDS RATIO - SAMPLE SIZE - SELECT STATISTICAL CONSULTANTS Formula. This calculator uses the following formula for the sample size, n a, for the absence group: n a = * where, X = 1 / ρ p (1-ρ p )k, and. Y = 1 / ρ a (1-ρ a ), and Z α/2 is the critical value of the Normal distribution at α/2 (e.g., for a confidence level of 95%, αPOPULATION MEAN
Formula. This calculator uses the following formula for the sample size n: n = N*X / (N + X – 1), where, X = Z α/22 * σ 2 / MOE 2, and Z α/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), MOE is the margin of error, σ 2 is the population variance THE IMPORTANCE AND EFFECT OF SAMPLE SIZE So, the proportion of men and women owning smartphones in our sample is 25/50=50% and 34/50=68%, with less men than women owning a smartphone. The difference between these two proportions is known as the observed effect size. In this case, we observe that the gender effect is to reduce the proportion by 18% for men relative to women. ODDS RATIO - CONFIDENCE INTERVAL - SELECT STATISTICAL Formula. This calculator uses the following formulae to calculate the odds ratio (or) and its confidence interval (ci). or = a*d / b*c, where: d is the number of times both A and B are negative. To calculate the confidence interval, we use the log odds ratio, log (or) = log (a*d/b*c), and calculate its standard error: The confidenceinterval
COMPARING TWO MEANS
Formula. This calculator uses the following formula for the sample size n: n = (Z α/2 +Z β) 2 *2*σ 2 / d 2, where Z α/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), Z β is the critical value of HOW DO SUPERMARKETS USE YOUR DATA? With the majority of large retailers offering a loyalty card scheme, the collection of customer data is now routine commercial practice. Whilst loyalty schemes were originally introduced to reward loyal customers and to encourage them to increase their overall spend, retailers have been finding more and more sophisticated ways to use customer data to their advantage. REGRESSION TO THE MEAN: AS RELEVANT TODAY AS IT WAS IN THE This statistical phenomenon is known as regression to the mean and occurs when repeated measurements are made. It means that, in general, relatively high (or low) observations are likely to be followed by less extreme ones nearer the subject’s true mean. Hence Galton’s use of regression: ‘regress’ means to go back or revert to an HOME - SELECT STATISTICAL CONSULTANTSABOUT USSECTORSSERVICESRESOURCESCONTACT USCASE STUDIES Select provides statistical services, data analytics and bespoke business solutions. Our clients range from large international corporations and public sector bodies to SME's and privateindividuals.
MEET OUR CONSULTANTS Who we Are and What we Do. To some we are statistical analysts, to others we are data scientists or statistical consultants. Whatever terminology you prefer, what characterises and drives us is identifying and using the best statistical tools to achieve greater understanding, improve decision making and solve practical problemsfor our clients.
COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showingsurprisingly good
DR KIM COCKS
Kim is a chartered medical statistician with more than 15 years’ experience in pharmaceutical companies, medical device companies, independent consultancy and academia. She has previously set up two statistics departments, writing their standard operating procedures and recruiting plus managing a team of up to 10 statisticians. Her clinical trials experience covers a variety of disease THE IMPORTANCE OF PROBABILITY IN LAW The probability that the defendant is guilty given the evidence (P(H|E)) is calculated using Bayes Theorem: We know that without any evidence, the probability of guilt (P(H)) is 1 in 1001 (for there were 1001 people present at the crime scene) and that the probability of finding the evidence of the matching size 13 shoes given the defendant is innocent is 1 in 100 (for size 13 shoes are found COMPARING TWO PROPORTIONS ASSESSING QUESTIONNAIRE VALIDITY Questionnaire surveys are measurement instruments. While scientific measurement instruments measure physical properties like velocity or weight, questionnaire surveys often measure respondents’ self-reported attitudes, opinions or behaviours. WHAT IS R AND WHY SHOULD YOU USE IT? The ability to analyse and interpret data is becoming an increasingly critical factor in driving commercial innovation and success. Maximising operational efficiency, understanding your customer base or monitoring quality control all requires data and the ability toanalyse it.
CUMULATIVE GAINS AND LIFT CURVES: MEASURING THE The dashed line in Figure 2 corresponds with “no gain”, i.e., what we would expect to achieve by contacting customers at random. The closer the cumulative gains line is to the top-left corner of the chart, the greater the gain; the higher the proportion of the responders that are reached for the lower proportion of customerscontacted.
ASSESSING QUESTIONNAIRE RELIABILITY Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customer HOME - SELECT STATISTICAL CONSULTANTSABOUT USSECTORSSERVICESRESOURCESCONTACT USCASE STUDIES Select provides statistical services, data analytics and bespoke business solutions. Our clients range from large international corporations and public sector bodies to SME's and privateindividuals.
MEET OUR CONSULTANTS Who we Are and What we Do. To some we are statistical analysts, to others we are data scientists or statistical consultants. Whatever terminology you prefer, what characterises and drives us is identifying and using the best statistical tools to achieve greater understanding, improve decision making and solve practical problemsfor our clients.
COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showingsurprisingly good
DR KIM COCKS
Kim is a chartered medical statistician with more than 15 years’ experience in pharmaceutical companies, medical device companies, independent consultancy and academia. She has previously set up two statistics departments, writing their standard operating procedures and recruiting plus managing a team of up to 10 statisticians. Her clinical trials experience covers a variety of disease THE IMPORTANCE OF PROBABILITY IN LAW The probability that the defendant is guilty given the evidence (P(H|E)) is calculated using Bayes Theorem: We know that without any evidence, the probability of guilt (P(H)) is 1 in 1001 (for there were 1001 people present at the crime scene) and that the probability of finding the evidence of the matching size 13 shoes given the defendant is innocent is 1 in 100 (for size 13 shoes are found COMPARING TWO PROPORTIONS ASSESSING QUESTIONNAIRE VALIDITY Questionnaire surveys are measurement instruments. While scientific measurement instruments measure physical properties like velocity or weight, questionnaire surveys often measure respondents’ self-reported attitudes, opinions or behaviours. WHAT IS R AND WHY SHOULD YOU USE IT? The ability to analyse and interpret data is becoming an increasingly critical factor in driving commercial innovation and success. Maximising operational efficiency, understanding your customer base or monitoring quality control all requires data and the ability toanalyse it.
CUMULATIVE GAINS AND LIFT CURVES: MEASURING THE The dashed line in Figure 2 corresponds with “no gain”, i.e., what we would expect to achieve by contacting customers at random. The closer the cumulative gains line is to the top-left corner of the chart, the greater the gain; the higher the proportion of the responders that are reached for the lower proportion of customerscontacted.
ASSESSING QUESTIONNAIRE RELIABILITY Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customerDR KIM COCKS
Kim is a chartered medical statistician with more than 15 years’ experience in pharmaceutical companies, medical device companies, independent consultancy and academia. She has previously set up two statistics departments, writing their standard operating procedures and recruiting plus managing a team of up to 10 statisticians. Her clinical trials experience covers a variety of disease POPULATION PROPORTION statistical calculator - Population Proportion - Sample Size. More Information Worked Example. If a retailer would like to estimate the proportion of their customers who bought an item after viewing their website on a certain day with a 95% confidence level and 5% margin of error, how many customers do they have to monitor? ODDS RATIO - SAMPLE SIZE - SELECT STATISTICAL CONSULTANTS Use this calculator to determine the appropriate sample size for estimating an odds ratio with a specified relative precision. An odds ratio is a measure of association between the ASSESSING QUESTIONNAIRE VALIDITY Questionnaire surveys are measurement instruments. While scientific measurement instruments measure physical properties like velocity or weight, questionnaire surveys often measure respondents’ self-reported attitudes, opinions or behaviours.COMPARING TWO MEANS
Use this calculator to determine the appropriate sample size for detecting a difference between the means of two samples. For example, is there a difference in mean blood pressure between patients who are taking a new treatment compared to the standard? ASSESSING QUESTIONNAIRE RELIABILITY Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customer THE IMPORTANCE AND EFFECT OF SAMPLE SIZE As our sample size increases, the confidence in our estimate increases, our uncertainty decreases and we have greater precision. This is clearly demonstrated by the HOW DO SUPERMARKETS USE YOUR DATA? With the majority of large retailers offering a loyalty card scheme, the collection of customer data is now routine commercial practice. Whilst loyalty schemes were originally introduced to reward loyal customers and to encourage them to increase their overall spend, retailers have been finding more and more sophisticated ways to use customer data to their advantage. ANALYSING CATEGORICAL SURVEY DATA Contingency tables are not only a neat way of tabulating the responses, but they can also be used in a more formal analysis. For example, we can test for independence between the education of respondents and their response using a Pearson’s chi-squared test or in this case (due to the small number of respondents in the Strongly Disagree category) a Fisher’s exact test. VISUALISING REFUGEE AND ASYLUM-SEEKER DATA The UN Refugee Agency (UNHCR) release annual statistics on the global situation of both asylum seekers and refugees. A refugee is a person fleeing conflict or persecution. They are defined and protected under international law, and must not be expelled or returned to situationswhere
HOME - SELECT STATISTICAL CONSULTANTSABOUT USSECTORSSERVICESRESOURCESCONTACT USCASE STUDIES Energy Saving Trust. Select are expert in applying statistical techniques to real-World commercial situations. They turn complex statistical ideas into simple, straightforward advice, making them an invaluable partner in developing our products and growing MEET OUR CONSULTANTS The freelance consultants we use are leaders in their field and each specialises in a particular area. However large, specific or unusual your statistical challenge might be, we have the skills and experience you need. All project work is co-ordinated and managed by Select to ensure consistently high standards of communication and customerservice.
COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? published on Wed, 25/11/2020. In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showing surprisingly good results. Pfizer and BioNTech announced their vaccine candidate was found to be more than 90% effective and less than a week later Moderna announced that their ODDS RATIO - SAMPLE SIZE - SELECT STATISTICAL CONSULTANTS Formula. This calculator uses the following formula for the sample size, n a, for the absence group: n a = * where, X = 1 / ρ p (1-ρ p )k, and. Y = 1 / ρ a (1-ρ a ), and Z α/2 is the critical value of the Normal distribution at α/2 (e.g., for a confidence level of 95%, α POPULATION PROPORTION Formula. This calculator uses the following formula for the sample size n: n = N*X / (X + N – 1), where, X = Z α/22 *p* (1-p) / MOE 2, and Z α/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), MOE is the margin of error, p is the sample proportion COMPARING TWO PROPORTIONS ODDS RATIO - CONFIDENCE INTERVAL - SELECT STATISTICALSEE MORE ON SELECT-STATISTICS.CO.UK ASSESSING QUESTIONNAIRE RELIABILITY Assessing Questionnaire Reliability. Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customer insight/satisfaction, product preferences in market research. We invariably use surveys because we want to measure something, forexample, how
ASSESSING QUESTIONNAIRE VALIDITY Criterion validity is the extent to which the measures derived from the survey relate to other external criteria. These external criteria can either be concurrent or predictive. Concurrent validity criteria are measured at the same time as the survey, either with questions embedded within the survey, or measures obtained from other sources. WHAT IS R AND WHY SHOULD YOU USE IT? Well, R is designed specifically for statistical computing and graphics. It is free and open source, the latter meaning that anyone can interrogate the code to see what’s going on – there’s no black box involved. R provides a flexible analysis toolkit where all of the standard statistical techniques are built-in. HOME - SELECT STATISTICAL CONSULTANTSABOUT USSECTORSSERVICESRESOURCESCONTACT USCASE STUDIES Energy Saving Trust. Select are expert in applying statistical techniques to real-World commercial situations. They turn complex statistical ideas into simple, straightforward advice, making them an invaluable partner in developing our products and growing MEET OUR CONSULTANTS The freelance consultants we use are leaders in their field and each specialises in a particular area. However large, specific or unusual your statistical challenge might be, we have the skills and experience you need. All project work is co-ordinated and managed by Select to ensure consistently high standards of communication and customerservice.
COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? published on Wed, 25/11/2020. In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showing surprisingly good results. Pfizer and BioNTech announced their vaccine candidate was found to be more than 90% effective and less than a week later Moderna announced that their ODDS RATIO - SAMPLE SIZE - SELECT STATISTICAL CONSULTANTS Formula. This calculator uses the following formula for the sample size, n a, for the absence group: n a = * where, X = 1 / ρ p (1-ρ p )k, and. Y = 1 / ρ a (1-ρ a ), and Z α/2 is the critical value of the Normal distribution at α/2 (e.g., for a confidence level of 95%, α POPULATION PROPORTION Formula. This calculator uses the following formula for the sample size n: n = N*X / (X + N – 1), where, X = Z α/22 *p* (1-p) / MOE 2, and Z α/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), MOE is the margin of error, p is the sample proportion COMPARING TWO PROPORTIONS ODDS RATIO - CONFIDENCE INTERVAL - SELECT STATISTICALSEE MORE ON SELECT-STATISTICS.CO.UK ASSESSING QUESTIONNAIRE RELIABILITY Assessing Questionnaire Reliability. Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customer insight/satisfaction, product preferences in market research. We invariably use surveys because we want to measure something, forexample, how
ASSESSING QUESTIONNAIRE VALIDITY Criterion validity is the extent to which the measures derived from the survey relate to other external criteria. These external criteria can either be concurrent or predictive. Concurrent validity criteria are measured at the same time as the survey, either with questions embedded within the survey, or measures obtained from other sources. WHAT IS R AND WHY SHOULD YOU USE IT? Well, R is designed specifically for statistical computing and graphics. It is free and open source, the latter meaning that anyone can interrogate the code to see what’s going on – there’s no black box involved. R provides a flexible analysis toolkit where all of the standard statistical techniques are built-in. MEET OUR CONSULTANTS The freelance consultants we use are leaders in their field and each specialises in a particular area. However large, specific or unusual your statistical challenge might be, we have the skills and experience you need. All project work is co-ordinated and managed by Select to ensure consistently high standards of communication and customerservice.
CALCULATORS
We’ve put together some free, online statistical calculators to help you carry out some basic statistical calculations of your own. We’ve chosen to put together some calculators for the types of analysis that we commonly undertake for our clients. Over time we’ll be adding to these online calculators to include other types of statisticalcalculations
COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? published on Wed, 25/11/2020. In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showing surprisingly good results. Pfizer and BioNTech announced their vaccine candidate was found to be more than 90% effective and less than a week later Moderna announced that theirPOPULATION MEAN
Formula. This calculator uses the following formula for the sample size n: n = N*X / (N + X – 1), where, X = Z α/22 * σ 2 / MOE 2, and Z α/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), MOE is the margin of error, σ 2 is the population variancePOPULATION MEAN
The confidence level is the probability that the confidence interval contains the true population mean. If the study was repeated and the range calculated each time, you would expect the true value to lie within these ranges on 95% of occasions. The higher the confidence level the more certain you can be that the interval contains the truemean.
THE IMPORTANCE AND EFFECT OF SAMPLE SIZE So, the proportion of men and women owning smartphones in our sample is 25/50=50% and 34/50=68%, with less men than women owning a smartphone. The difference between these two proportions is known as the observed effect size. In this case, we observe that the gender effect is to reduce the proportion by 18% for men relative to women.COMPARING TWO MEANS
Formula. This calculator uses the following formula for the sample size n: n = (Z α/2 +Z β) 2 *2*σ 2 / d 2, where Z α/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), Z β is the critical value of CUMULATIVE GAINS AND LIFT CURVES: MEASURING THE The dashed line in Figure 2 corresponds with “no gain”, i.e., what we would expect to achieve by contacting customers at random. The closer the cumulative gains line is to the top-left corner of the chart, the greater the gain; the higher the proportion of the responders that are reached for the lower proportion of customerscontacted.
HOW DO SUPERMARKETS USE YOUR DATA? With the majority of large retailers offering a loyalty card scheme, the collection of customer data is now routine commercial practice. Whilst loyalty schemes were originally introduced to reward loyal customers and to encourage them to increase their overall spend, retailers have been finding more and more sophisticated ways to use customer data to their advantage. REGRESSION TO THE MEAN: AS RELEVANT TODAY AS IT WAS IN THE This statistical phenomenon is known as regression to the mean and occurs when repeated measurements are made. It means that, in general, relatively high (or low) observations are likely to be followed by less extreme ones nearer the subject’s true mean. Hence Galton’s use of regression: ‘regress’ means to go back or revert to an HOME - SELECT STATISTICAL CONSULTANTSABOUT USSECTORSSERVICESRESOURCESCONTACT USCASE STUDIES Energy Saving Trust. Select are expert in applying statistical techniques to real-World commercial situations. They turn complex statistical ideas into simple, straightforward advice, making them an invaluable partner in developing our products and growing MEET OUR CONSULTANTS The freelance consultants we use are leaders in their field and each specialises in a particular area. However large, specific or unusual your statistical challenge might be, we have the skills and experience you need. All project work is co-ordinated and managed by Select to ensure consistently high standards of communication and customerservice.
ODDS RATIO - SAMPLE SIZE - SELECT STATISTICAL CONSULTANTS Formula. This calculator uses the following formula for the sample size, n a, for the absence group: n a = * where, X = 1 / ρ p (1-ρ p )k, and. Y = 1 / ρ a (1-ρ a ), and Z α/2 is the critical value of the Normal distribution at α/2 (e.g., for a confidence level of 95%, α POPULATION PROPORTION Formula. This calculator uses the following formula for the sample size n: n = N*X / (X + N – 1), where, X = Z α/22 *p* (1-p) / MOE 2, and Z α/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), MOE is the margin of error, p is the sample proportion COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? published on Wed, 25/11/2020. In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showing surprisingly good results. Pfizer and BioNTech announced their vaccine candidate was found to be more than 90% effective and less than a week later Moderna announced that their COMPARING TWO PROPORTIONS ASSESSING QUESTIONNAIRE VALIDITY Criterion validity is the extent to which the measures derived from the survey relate to other external criteria. These external criteria can either be concurrent or predictive. Concurrent validity criteria are measured at the same time as the survey, either with questions embedded within the survey, or measures obtained from other sources. THE IMPORTANCE AND EFFECT OF SAMPLE SIZE ASSESSING QUESTIONNAIRE RELIABILITY Assessing Questionnaire Reliability. Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customer insight/satisfaction, product preferences in market research. We invariably use surveys because we want to measure something, forexample, how
MARKET BASKET ANALYSIS: UNDERSTANDING CUSTOMER BEHAVIOUR Market Basket Analysis is a useful tool for retailers who want to better understand the relationships between the products that people buy. There are many tools that can be applied when carrying out MBA and the trickiest aspects to the analysis are setting the confidence and support thresholds in the Apriori algorithm and identifying which rules are worth pursuing. HOME - SELECT STATISTICAL CONSULTANTSABOUT USSECTORSSERVICESRESOURCESCONTACT USCASE STUDIES Energy Saving Trust. Select are expert in applying statistical techniques to real-World commercial situations. They turn complex statistical ideas into simple, straightforward advice, making them an invaluable partner in developing our products and growing MEET OUR CONSULTANTS The freelance consultants we use are leaders in their field and each specialises in a particular area. However large, specific or unusual your statistical challenge might be, we have the skills and experience you need. All project work is co-ordinated and managed by Select to ensure consistently high standards of communication and customerservice.
ODDS RATIO - SAMPLE SIZE - SELECT STATISTICAL CONSULTANTS Formula. This calculator uses the following formula for the sample size, n a, for the absence group: n a = * where, X = 1 / ρ p (1-ρ p )k, and. Y = 1 / ρ a (1-ρ a ), and Z α/2 is the critical value of the Normal distribution at α/2 (e.g., for a confidence level of 95%, α POPULATION PROPORTION Formula. This calculator uses the following formula for the sample size n: n = N*X / (X + N – 1), where, X = Z α/22 *p* (1-p) / MOE 2, and Z α/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), MOE is the margin of error, p is the sample proportion COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? published on Wed, 25/11/2020. In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showing surprisingly good results. Pfizer and BioNTech announced their vaccine candidate was found to be more than 90% effective and less than a week later Moderna announced that their COMPARING TWO PROPORTIONS ASSESSING QUESTIONNAIRE VALIDITY Criterion validity is the extent to which the measures derived from the survey relate to other external criteria. These external criteria can either be concurrent or predictive. Concurrent validity criteria are measured at the same time as the survey, either with questions embedded within the survey, or measures obtained from other sources. THE IMPORTANCE AND EFFECT OF SAMPLE SIZE ASSESSING QUESTIONNAIRE RELIABILITY Assessing Questionnaire Reliability. Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customer insight/satisfaction, product preferences in market research. We invariably use surveys because we want to measure something, forexample, how
MARKET BASKET ANALYSIS: UNDERSTANDING CUSTOMER BEHAVIOUR Market Basket Analysis is a useful tool for retailers who want to better understand the relationships between the products that people buy. There are many tools that can be applied when carrying out MBA and the trickiest aspects to the analysis are setting the confidence and support thresholds in the Apriori algorithm and identifying which rules are worth pursuing.CALCULATORS
We’ve put together some free, online statistical calculators to help you carry out some basic statistical calculations of your own. We’ve chosen to put together some calculators for the types of analysis that we commonly undertake for our clients. Over time we’ll be adding to these online calculators to include other types of statisticalcalculations
COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? published on Wed, 25/11/2020. In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showing surprisingly good results. Pfizer and BioNTech announced their vaccine candidate was found to be more than 90% effective and less than a week later Moderna announced that theirTWO-SAMPLE T-TEST
This test is known as an a two sample (or unpaired) t-test. It produces a “p-value”, which can be used to decide whether there is evidence of a difference between the two population means. The p-value is the probability that the difference between the sample means is at least as large as what has been observed, under the assumption thatthe
COMPARING TWO MEANS
Formula. This calculator uses the following formula for the sample size n: n = (Z α/2 +Z β) 2 *2*σ 2 / d 2, where Z α/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), Z β is the critical value of ASSESSING QUESTIONNAIRE RELIABILITY Assessing Questionnaire Reliability. Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customer insight/satisfaction, product preferences in market research. We invariably use surveys because we want to measure something, forexample, how
WHAT IS R AND WHY SHOULD YOU USE IT? Well, R is designed specifically for statistical computing and graphics. It is free and open source, the latter meaning that anyone can interrogate the code to see what’s going on – there’s no black box involved. R provides a flexible analysis toolkit where all of the standard statistical techniques are built-in. CUMULATIVE GAINS AND LIFT CURVES: MEASURING THE The dashed line in Figure 2 corresponds with “no gain”, i.e., what we would expect to achieve by contacting customers at random. The closer the cumulative gains line is to the top-left corner of the chart, the greater the gain; the higher the proportion of the responders that are reached for the lower proportion of customerscontacted.
VISUALISING REFUGEE AND ASYLUM-SEEKER DATA A refugee is a person fleeing conflict or persecution. They are defined and protected under international law, and must not be expelled or returned to situations where their life and freedom are at risk. An asylum-seeker is an individual who has sought international protection and whose claim for refugee status has yet to bedetermined.
HOW DO SUPERMARKETS USE YOUR DATA? With the majority of large retailers offering a loyalty card scheme, the collection of customer data is now routine commercial practice. Whilst loyalty schemes were originally introduced to reward loyal customers and to encourage them to increase their overall spend, retailers have been finding more and more sophisticated ways to use customer data to their advantage. THE IMPORTANCE OF PROBABILITY IN LAW The Importance of Probability in Law. written by Steve Brooks. published on Tue, 22/10/2013. The second joint ExIStA and RSS South West Local Group seminar took place on the 11 th October with invited speaker Norman Fenton, Director of Risk and Information Management Research at Queen Mary University of London and CEO of Agena Ltd . HOME - SELECT STATISTICAL CONSULTANTSABOUT USSECTORSSERVICESRESOURCESCONTACT USCASE STUDIES Select provides statistical services, data analytics and bespoke business solutions. Our clients range from large international corporations and public sector bodies to SME's and privateindividuals.
MEET OUR CONSULTANTS Who we Are and What we Do. To some we are statistical analysts, to others we are data scientists or statistical consultants. Whatever terminology you prefer, what characterises and drives us is identifying and using the best statistical tools to achieve greater understanding, improve decision making and solve practical problemsfor our clients.
ODDS RATIO - SAMPLE SIZE - SELECT STATISTICAL CONSULTANTS Use this calculator to determine the appropriate sample size for estimating an odds ratio with a specified relative precision. An odds ratio is a measure of association between the POPULATION PROPORTION statistical calculator - Population Proportion - Sample Size. More Information Worked Example. If a retailer would like to estimate the proportion of their customers who bought an item after viewing their website on a certain day with a 95% confidence level and 5% margin of error, how many customers do they have to monitor? COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showingsurprisingly good
COMPARING TWO PROPORTIONS ASSESSING QUESTIONNAIRE VALIDITY Questionnaire surveys are measurement instruments. While scientific measurement instruments measure physical properties like velocity or weight, questionnaire surveys often measure respondents’ self-reported attitudes, opinions or behaviours. THE IMPORTANCE AND EFFECT OF SAMPLE SIZE ASSESSING QUESTIONNAIRE RELIABILITY Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customer THE IMPORTANCE OF PROBABILITY IN LAW The probability that the defendant is guilty given the evidence (P(H|E)) is calculated using Bayes Theorem: We know that without any evidence, the probability of guilt (P(H)) is 1 in 1001 (for there were 1001 people present at the crime scene) and that the probability of finding the evidence of the matching size 13 shoes given the defendant is innocent is 1 in 100 (for size 13 shoes are found HOME - SELECT STATISTICAL CONSULTANTSABOUT USSECTORSSERVICESRESOURCESCONTACT USCASE STUDIES Select provides statistical services, data analytics and bespoke business solutions. Our clients range from large international corporations and public sector bodies to SME's and privateindividuals.
MEET OUR CONSULTANTS Who we Are and What we Do. To some we are statistical analysts, to others we are data scientists or statistical consultants. Whatever terminology you prefer, what characterises and drives us is identifying and using the best statistical tools to achieve greater understanding, improve decision making and solve practical problemsfor our clients.
ODDS RATIO - SAMPLE SIZE - SELECT STATISTICAL CONSULTANTS Use this calculator to determine the appropriate sample size for estimating an odds ratio with a specified relative precision. An odds ratio is a measure of association between the POPULATION PROPORTION statistical calculator - Population Proportion - Sample Size. More Information Worked Example. If a retailer would like to estimate the proportion of their customers who bought an item after viewing their website on a certain day with a 95% confidence level and 5% margin of error, how many customers do they have to monitor? COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showingsurprisingly good
COMPARING TWO PROPORTIONS ASSESSING QUESTIONNAIRE VALIDITY Questionnaire surveys are measurement instruments. While scientific measurement instruments measure physical properties like velocity or weight, questionnaire surveys often measure respondents’ self-reported attitudes, opinions or behaviours. THE IMPORTANCE AND EFFECT OF SAMPLE SIZE ASSESSING QUESTIONNAIRE RELIABILITY Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customer THE IMPORTANCE OF PROBABILITY IN LAW The probability that the defendant is guilty given the evidence (P(H|E)) is calculated using Bayes Theorem: We know that without any evidence, the probability of guilt (P(H)) is 1 in 1001 (for there were 1001 people present at the crime scene) and that the probability of finding the evidence of the matching size 13 shoes given the defendant is innocent is 1 in 100 (for size 13 shoes are foundCALCULATORS
We’ve put together some free, online statistical calculators to help you carry out some basic statistical calculations of your own. We’ve chosen to put together some calculators for the types of analysis that we commonly undertake for our clients. Over time we’ll be adding to these online calculators to include other types of statisticalcalculations
POPULATION PROPORTION statistical calculator - Population Proportion - Sample Size. More Information Worked Example. If a retailer would like to estimate the proportion of their customers who bought an item after viewing their website on a certain day with a 95% confidence level and 5% margin of error, how many customers do they have to monitor? COVID-19 VACCINES: WHAT DOES 90% EFFECTIVE MEAN? In the past few weeks, we’ve heard from multiple pharmaceutical companies that interim results of their Covid-19 vaccines are showing surprisingly good results.TWO-SAMPLE T-TEST
Use this calculator to test whether samples from two independent populations provide evidence that the populations have different means. For example, based on blood pressures measurements taken from a sample of women and a sample of men, can we conclude that women and men have different mean blood pressures?COMPARING TWO MEANS
Use this calculator to determine the appropriate sample size for detecting a difference between the means of two samples. For example, is there a difference in mean blood pressure between patients who are taking a new treatment compared to the standard? ASSESSING QUESTIONNAIRE RELIABILITY Questionnaire surveys are a useful tool used to gather information from respondents in a wide variety of contexts; self-reported outcomes in healthcare, customer WHAT IS R AND WHY SHOULD YOU USE IT? The ability to analyse and interpret data is becoming an increasingly critical factor in driving commercial innovation and success. Maximising operational efficiency, understanding your customer base or monitoring quality control all requires data and the ability toanalyse it.
CUMULATIVE GAINS AND LIFT CURVES: MEASURING THE The dashed line in Figure 2 corresponds with “no gain”, i.e., what we would expect to achieve by contacting customers at random. The closer the cumulative gains line is to the top-left corner of the chart, the greater the gain; the higher the proportion of the responders that are reached for the lower proportion of customerscontacted.
HOW DO SUPERMARKETS USE YOUR DATA? With the majority of large retailers offering a loyalty card scheme, the collection of customer data is now routine commercial practice. Whilst loyalty schemes were originally introduced to reward loyal customers and to encourage them to increase their overall spend, retailers have been finding more and more sophisticated ways to use customer data to their advantage. VISUALISING REFUGEE AND ASYLUM-SEEKER DATA The UN Refugee Agency (UNHCR) release annual statistics on the global situation of both asylum seekers and refugees. A refugee is a person fleeing conflict or persecution. They are defined and protected under international law, and must not be expelled or returned to situationswhere
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> Select’s advice was invaluable in exploring the use of statistics > within the CCAS. They understood what we wanted to achieve, and > provided straightforward and understandable advice on a very > specialist and complex subject.> Andy Foster
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