Example.Data            An example dataset
Explore.WS.Corr         Explore within-subject correlations
                        (reliabilities)
Fract.Poly              Fit fractional polynomials
Heatmap                 Plot a heatmap of the correlation structure
Model.Fit               Compare the fit of linear mixed-effects models
Spaghetti.Plot          Make a Spaghetti plot
WS.Corr.Mixed           Estimate within-subject correlations
                        (reliabilities) based on a mixed-effects model.
WS.Corr.Mixed.SAS       Estimate within-subject (test-retest)
                        correlations based on a mixed-effects model
                        using the SAS proc MIXED output.
plot Explore.WS.Corr    Plot of exploratory within-subject correlations
                        (reliabilities)
plot.WS.Corr.Mixed      Plot the within-subject correlations
                        (reliabilities) obtained by using the
                        mixed-effects modeling approch
