calculate_mean_matrix   Create input for simulation based two-way
                        factorial experiments
effsize                 Effect size calculation
exact_twoway_anova_power
                        Two-way factorial ANOVA exact sample size
                        calculation for independent samples
gencorrelationmat       Function that generates a correlation matrix
                        taking as input number of factors for each
                        level, factor or factors that present
                        correlation and rho value or values.
                        Additionally, a mean matrix is required to
                        check consistency.
gencovariancemat        Function that generates a covariance matrix
                        taking as input a correlation matrix and a
                        standard deviation matrix or value.
graph_twoway_assumptions
                        Graph modeled means and standard deviations of
                        groups in two-way factorial design
plot_powercurves        Plots the output of test_twoway_nrange
simulate_twoway_nrange
                        Simulated independent and repeated measures
                        two-way experiments over a set of sample sizes
test_power_overkn       Test simulated two-way factorial design
                        experiments over different sample sizes.
twoway_simulation_correlated
                        Simulate measurements repeated over either or
                        both factors of a two-way design
twoway_simulation_independent
                        Simulate independent measurements in a two-way
                        factorial design
twoway_simulation_testing
                        Calculate power for global main effects and
                        interaction from two-way factorial simulated
                        data
