Tutorial Gpower - Statpower

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.

Post-hoc Power Analysis For the sake of this example, let us assume that the mean word-stem completion performance for amnesics (14.5) and normals (16) as observed by Warrington and

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