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Practical guide to sample size calculations: non-inferiority and equivalence trials
Laura Flight1, Steven A Julious1
1Medical Statistics Group, The University of Sheffield, Sheffield, UK.
Abstract:
A sample size justification is a vital part of any trial design. However, estimating the number of participants required to give a meaningful result is not always straightforward. A number of components are required to facilitate a suitable sample size calculation. In this paper, the steps for conducting sample size calculations for non-inferiority and equivalence trials are summarised. Practical advice and examples are provided that illustrate how to carry out the calculations by hand and using the app SampSize.
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