cv.interep              k-folds cross-validation for interep
dat                     simulated data for demonstrating the features
                        of interep
dmcp                    This function obtains the first derivative
                        function of MCP (Minimax Concave Penalty)
interep                 fit generalized estimaitng equations with given
                        tuning parameters
penalty                 This function gives the penalty functions
reformat                This function changes the format of the
                        longitudinal data from wide format to long
                        format
