the previous educational articles, we explained how to calculate the sample size for a rate or a single proportion, for an independent cohort study, for an independent case-control study, for a diagnostic test accuracy study, for a superiority clinical trial, and for a non-inferiority or equivalence clinical trial. In this article, we will explain how to calculate the sample size for a clinical study with the aim of detecting the correlation coefficient between two variables.
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Ahmed Negida (2020) studied this question.
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