cusum                   Generates CUSUM values for Rasch, 2PL and 3PL
                        IRT model based on the Van Krimpen-Stoop &
                        Meijer, (2002).
cusum.cutoff            Generates critical values for CUSUM statisitcs.
cusum.flag              Flags aberrant participants based on CUSUM
                        statistics.
cusum.plot              Generates CUSUM plot for specified IDs.
cusum.poly              Generates CUSUM values for polytomous IRT model
                        based on Van Krimpen-Stoop & Meijer, (2002).
ex2PL                   Example data set based on a simulated 2PL
                        model.
exGRM                   Example data set based on a simulated GRM
                        model.
gh                      Example data set based on a simulated GRM
                        model.
