POWER is a windows-based program for computation of sample size and power for binary outcome studies (case-control and cohort studies) based on a logistic-like regression model with one covariate or two covariates (e.g., gene X exposure interactions).
:: MORE INFORMATION
Garcia-Closas, Lubin (1999),
“Power and sample size calculations in case-control studies of gene-environmental interactions: Comments on different approaches“,
American Journal of Epidemiology, 149:689-693.