Examining Power Calculations
Introduction & Problem Statement Calculating sample sizes while accounting for power is relatively straightforward if you have all the required inputs. Many universities have online calculators that help you determine the appropriate sample size. The variables needed to calculate the sample size while accounting for power are listed below. This article will utilize Cohen’s d calculations in the examples presented. If you are unfamiliar with any of the terms below, please click on any symbols for more information. Significance Level α Power (1 - β) Mean difference of the two distributions μ d The pooled standard deviation of the two distributions σ d Effect Size μ d / σ d In this type of problem, the significance level and power variables should be pre-determined, and two common values are traditionally set at 0.05 and 0.80, respectively. The effect size is calculated by estimating or assuming the two groups’ mean difference and pooled standard deviation. Estimating ...
