Compute_Power           Compute the Power of an association study, at a
                        given sample size.
Compute_Power_multi     Compute the Power of an association study at a
                        given sample size, accommodating more than one
                        covariates, using the Semi-Simulation method.
Compute_Size            Compute the sample size of an association
                        study, to achieve a target power.
Compute_Size_multi      Compute the sample size of an association study
                        to achieve a target power for multiple E's,
                        using semi-sim.
check_parameters        Check if the parameter list contains all the
                        parameters required for the computation.
convert_preva_to_intercept
                        Convert the prevalence value to the intercept
                        value beta0.
