Go to SWOG Web site

Interaction Binomial
Sample size

Power

1 Sided

2 Sided

Alpha
Cell Freq Treat1/Strat1 Cell Freq Treat1/Strat2
 Cell Freq Treat2/Strat1 Cell Freq Treat2/Strat2
Event Prob Treat1/Strat1 Event Prob Treat1/Strat2
Odds ratio    T1/T2  in Strat1 Odds ratio T1/T2 in Strat2
                Power               Sample size

                Help Document