RetroJM                 Fit the two-stage model for survival imputation
                        and longitudinal analysis
Retro_data              Simulated retrospective joint modeling data for
                        'RetroJM()'
TTM                     Fit a weighted GEE terminal trend model on the
                        retrospective time scale
TTM_data                Simulated terminal trend data for 'TTM()'
TTM_linear              Fit a weighted GEE terminal trend model with a
                        linear spline basis
get_beta_A              Evaluate the estimated treatment effect
                        trajectory on the retrospective time scale
get_beta_mu             Get the estimated baseline retrospective
                        trajectory with pointwise confidence intervals
plot_beta_A             Plot the estimated treatment effect trajectory
                        on the retrospective time scale
plot_beta_mu            Plot the estimated baseline trajectory on the
                        retrospective time scale
test_beta_slope         Test for a change in slope at a knot of a
                        linear-spline trajectory
