Evaluation of Three Sample Size Formulae for 2 × 2 Contingency Tables

Tables are given for the rapid estimation of h, the effect size index for the difference between independent proportions, and of q, the effect size index for the difference between independent correlation coefficients. The tables are accurate to three decimal places and may be used conveniently in conjunction with tables and charts of power and sample size. Formulas for power and sample size estimation are also presented.

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Evaluation of Three Sample Size Formulae for 2 × 2 Contingency Tables

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Approaches to sample size estimation in the design of clinical trials—a review

Approaches to sample size estimation in the design of clinical trials—a review

Tables of Effect Size for Z Score Tests of Differences between Proportions and between Correlation Coefficients

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