GPower is only equipped to deal with calculations of bivariate regressions and needs SD s for both predictor samples.
However, if one has a multiple regression with more than 2 outcome variables (multivariate) , is there a way to calculate sample size with an alpha of 0.05 and assuming a moderate effect size of 0.35 apriori?
thanks in advance.
Sure just Google your question ask.for examples or videos. U will.be surprised I bet. Best wishes, David Booth
Dear Simantini Ghosh ,
For once I would not recommend David Eugene Booth 's advice as there is no guarantee of quality if you simply Google. My advice would be to use G* Power which is the widely recommended free software for sample size calculations. There is also a table on this specific subject in Andy Field's textbook on discovering statistics using SPSS.
@, everybody If you bother to google the question the first entry is the answer to her question using G power. Suggest you try it before you knock it. I have seen recently comments about the quality of answers in RG suggestion Think before you write and try simple easy suggestions first. David Booth I would be pleased for people to check the qualifications of those of us that give answers. Perhaps then things like stepwise regression will finally die out.
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