gets a generalized linear model fit for TD rank curve
tdrankglm( tdr, familytxt = c( "gaussian" ), link = make.link( "logit" ),
                  rankCentral = NULL )table with TD rank curve
central ranked positions to use in the fit. By default it is NULL, so that all rank locations are used for the fit
fitted values of the generalized linear model fit for TD rank curve
details