power_Beta              Power Calculations for Test of Two Beta Means
power_Binomial          Power Calculations for Two-Sample Test for
                        Proportions
power_Gamma             Power Calculations for Test of Two Gamma Means
power_Geometric         Power Calculation for Comparing Two Geometric
                        Rates.
power_NegativeBinomial
                        Power Calculation for Comparing Two Negative
                        Binomial Rates
power_Normal            Power Calculations for One and Two Sample
                        T-tests
power_Poisson           Power Calculations for Test of Two Poisson
                        Ratios
