alexa Estimating sample sizes for binary, ordered categorical, and continuous outcomes in two group comparisons.
Dermatology

Dermatology

Journal of Cosmetology & Trichology

Author(s): Campbell MJ, Julious SA, Altman DG

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Abstract Sample size calculations are now mandatory for many research protocols, but the ones useful in common situations are not all easily accessible. This paper outlines the ways of calculating sample sizes in two group studies for binary, ordered categorical, and continuous outcomes. Formulas and worked examples are given. Maximum power is usually achieved by having equal numbers in the two groups. However, this is not always possible and calculations for unequal group sizes are given.
This article was published in BMJ and referenced in Journal of Cosmetology & Trichology

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