Study Planning

Power of the single study

Interpretation: In the field of interest, a single study of a given sample size n=NaN (x-axis) would correctly reject a false null hypothesis on the effect size of interest with a probability of NaN % (y-axis), assuming the meta-analytic estimate as the true underlying effecct size. Thus, to achieve 80 % power for the single study, a sample size of n=NaN (x-axis) would be needed.

The plot shows the uncertainty in the power estimation due to uncertainty about the assumed effect size. The lower and upper curve in the plot show the power estimations assuming the lower and upper bounds of the meta-analytic effect size estimation as true effect size.