Hello
I currently have two dependent variables (with 4 measurements each) and two independent variables
My question is how to calculate the sample size using Gpower for multivariate multiple regression. since we only have multiple linear regression in Gpower
what statistical test to use? (t-test? F-test?)
otherwise is there another toll to do the calculations?
Thank you
Dear Hajar deqqaq ,
The choice depends on the purpose of your multiple linear regression test. The t-test family for linear regression involves a bivariate model (one dependent, one independent) to assess either size of slope if there is one group or if there is more than one group to assess differeces in intercepts or slopes of the regression per group. On the other hand, if you have n>1 predictor and a dependent variable, you would estimate sample size using an F-test, where the effect size would be aimed at increases in R2 or R2 deviation from zero. Based on the information you provided I would estimate it using an F-test for R2 deviation from zero.
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