rank.L2R                Rank responses under the Bayesian framework
                        according to the loss function in Method 3 of
                        Wang and Huang (2004).
rank.LN                 Rank responses under the Bayesian framework
                        according to the loss function in Method 1 of
                        Wang and Huang (2004).
rank.btmm               Rank responses based on the Bradley-Terry model
                        with the MM method
rank.btnr               Rank responses based on the Bradley-Terry model
                        with Newton-Raphson method
rank.btqn               Rank responses based on the Bradley-Terry model
                        with the quasi-Newton accelerated MM method
rank.gs                 Rank responses based on the Generalized score
                        test
rank.wald               Rank responses based on the Wald test
