I'm trying to perform a sample size calculation for a 2x3 contingency table, comparing the mortality rate (expressed as proportion), between three groups (A, B & C). I'd like to use an effect size of 5% between group A and B, and 5% between group B and C. My PASS software only allows me to input a single effect size expressed as "w", which, as far as I can tell, doesn't correspond to the proportional difference between groups. What am I missing? Any help would be deeply appreciated.