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Abstract I suggest for memorization an equation for calculating approximate sample size requirements intended only for a specific set of values (80 per cent power for a two‐tailed alpha = 0.05 test) which seems to occur often in biopharmaceutical research. After presenting the formula in terms of variance estimate s 2 and effect size d , I derive a few alternative forms and then discuss the accuracy of the approximation and other properties as well as examples of its use.
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Robert Lehr (Wed,) studied this question.
www.synapsesocial.com/papers/69ff7e246018b8d0892d8603 — DOI: https://doi.org/10.1002/sim.4780110811
Robert Lehr
Statistics in Medicine
Specialty Materials (United States)
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