Counting Your Chickens before They’re Hatched: Power Analysis

Abstract: How does an investigator know that he has enough subjects in his study design to have the predicted outcomes appear statistically significant? In this Investigators’ Corner I discuss why such planning is necessary, give an intuitive introduction to the calculations needed to determine required sample sizes, and hint at some of the more technical difficulties inherent in this aspect of study planning.

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Counting Your Chickens before They’re Hatched: Power Analysis

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