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Introduction to Power Analysis

In this series of ‘eat your greens‘ posts looking at core statistical concepts in more detail, we have looked closely at what a test of statistical significance actually is. In particular, we have focused on how to interpret the statistical probability value that various tests generate. This value, often labelled ‘P=’, ‘Prob’ or ‘Sig.’ in …

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What’s new in SPSS v27.0.1.0?

IBM have released a new update to SPSS v27. Interestingly, this is a ‘dot’ release that contains a number of useful functional improvements rather than the usual bug fixes or third-party compatibility enhancements. The new procedures include three additional statistical tests for comparing differences in proportions. These procedures were introduced as syntax only commands in …

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Understanding correlation

This is the latest in our ‘eat your greens’ series – a back to basics look at core statistical concepts that are often misunderstood or misapplied. In everyday speech the term ‘correlation’ refers to a mutual connection or relationship between two things. In statistics correlations are specific measures or values that attempt to quantify the …

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The type of spreadsheet error that caused the loss of 16,000 coronavirus test results in England isn’t unusual – the limitations of spreadsheets are well known

Spreadsheets have been much in the news over the last couple of days in the UK, and not for good reasons. It looks as though Excel’s limit on the number of rows of data possible in a spreadsheet has led to Public Health England misplacing more than 16,000 Covid test results. The implications of this …

The type of spreadsheet error that caused the loss of 16,000 coronavirus test results in England isn’t unusual – the limitations of spreadsheets are well known Read More »

Finding normality – why is the normal distribution so important when we so rarely encounter it in real life?

This is the fourth post in our ‘eat your greens’ series – a back to basics look at some of the core concepts of statistics and analytics that, in our experience, are frequently misunderstood or misapplied. In this post we’ll look in more depth at the concept of the normal distribution.  One of the first …

Finding normality – why is the normal distribution so important when we so rarely encounter it in real life? Read More »

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Are algorithms evil?

None of us can have failed to notice the recent debacle over Ofqual’s (the Office of Qualifications and Examinations Regulation) use of an algorithm to predict pupil grades. Once again, ‘algorithm fever’ has generated a flurry of news articles questioning whether we are sleepwalking into a dystopian future where human expert decision-making is replaced with …

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Testing versus inferring

This is the second post in our ‘eat your greens’ series – a back to basics look at some of the core concepts of statistics and analytics that, in our experience, are frequently misunderstood or misapplied. In this post we’ll look in more depth at the concept of testing versus inferring. One of most daunting …

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