Hi, My data has a categorical independent variable (3 groups) and a dicohotomous (yes/no) dependent variable. I was planning to use a Chi-squared test to see if there is a difference between the groups. However I first need to calculate the sample size, since I didn't find a way to do this in SPSS I am trying to do this in SAS studio. Is this the correct test to use for my data types or are there better tests to do it? How do I calculate the sample size if the alfa is 0.05, the power is 0.80 and I have a 3X2 tabel as described above?
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