Tutorial Gpower - Statpower

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Gpower Tutorial Before we begin this Tutorial , we would like to give you a general advice for performing power analyses. A very frequent error in performing power analyses with G* power is to specify incorrect degrees of freedom. As a general rule, therefore, we recommend that you routinely compare the degrees of freedom as specified in G* power with the degrees of freedom that your statistical analysis program gives you for an appropriate set of data. If you do not yet have your data set ( , in the case of an a priori power analysis), then you could simply create an appropriate artificial data set and check the degrees of freedom for this set.

Referenced pages Post-hoc power analyses Post-hoc power analyses are done after you or someone else conducted an experiment. You have: • alpha, • N (the total sample size), • and the effect size. You want to know

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