COP                     This package is for selecting variables for
                        index models using correlation pursuit.
backward.corp           Backward selection step in COP
chisq.in                This is the function to calculate the
                        chi-square in statistics in COP
chisq.out               The function is used to calculate chisquare out
                        statistics in COP
cop                     This function is for selecting variables for
                        index models
forward.corp            Forward selection in COP
starting                starting is a function to select the first two
                        important predictors to start with
