The stepped wedge cluster randomised trial: what it is and when it should be used

1 April 2019 - The basic premise of a stepped wedge cluster randomised trial is that all clusters start in the ...

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Understanding statistical principles in linear and logistic regression

7 May 2018 - A previous article in this series assessed the association between two variables. Here, we introduce the concept ...

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Standard deviation and standard error: interpretation, usage and reporting

5 February 2018 - Standard deviations and standard errors are reported routinely in statistical analyses, but the distinction between them is ...

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Distributions and what to do when they are non-normal

15 January 2018 - Medical researchers often want to find out how medically relevant outcomes are related to other factors.  ...

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