as.lgtdl                Longitudinal Class
getcov                  A function to extract the covariate from an
                        object of class lgtdl.
interplinear            A function to provide estimates of the response
                        for a longitudinal data object. The estimate is
                        obtained by linear interpolation from the
                        preceding and following observations.
interpprev              Interpolation Using the Previous Value
lgtdl                   Longitudinal Class
plot.lgtdl              A function for plotting lgtdl objects.
toString.lgtdl          Produce a character string suitable for
                        printing.
