LLTM_test               Testing linear restrictions on parameter space
                        of item parameters of RM.
change_test             Tests in context of measurement of change using
                        LLTM.
cml_power               Power and Power Curve Functions
discr_test              Testing item discriminations
get_eRm_arg             Extract Arguments from an eRm Object
invar_test              Test of invariance of item parameters between
                        two groups.
mix_mod                 Mixed model considering the effects of multiple
                        covariates .
opt_n                   Computes the optimal sample size for item
                        parameter invariance tests.
post_hocChange          Power analysis of tests in context of
                        measurement of change using LLTM
post_hocPCM             Power analysis of tests of invariance of item
                        parameters between two groups of persons in
                        partial credit model
post_hocRM              Power analysis of tests of invariance of item
                        parameters between two groups of persons in
                        binary Rasch model
powerChange             Power analysis of tests in context of
                        measurement of change using LLTM
powerPCM                Power analysis of tests of invariance of item
                        parameters between two groups of persons in
                        partial credit model
powerRM                 Power analysis of tests of invariance of item
                        parameters between two groups of persons in
                        binary Rasch model
sa_sizeChange           Sample size planning for tests in context of
                        measurement of change using LLTM
sa_sizePCM              Sample size planning for tests of invariance of
                        item-category parameters between two groups of
                        persons in partial credit model
sa_sizeRM               Sample size planning for tests of invariance of
                        item parameters between two groups of persons
                        in binary Rasch model
tcl_hessian             Computation of Hessian matrix.
tcl_scorefun            Computation of score function.
