Gpower Calculator. Screenshots click to enlarge. You can navigate the calculators using the menu to the left.
GPower is a free-to use software used to calculate statistical power. GPower can also be used to compute effect sizes and to display graphically the results of power analyses. The program offers the ability to calculate power for a wide variety of statistical tests including t-tests F-tests and chi-square-tests among others.
The calculations are the customary ones based on normal distributions.
Next GPower needs the following input. We take the time to compare our calculators output to published results. 4 8 You can now press the Calculate button and observe the following result. Moreover our computation code is open-source mathematical formulas are given for each calculator and we even provide R code for the adventurous.
