expand_responses        Helper functions for manipulating generated
                        responses
generate_intercepts     Generating parameters of items - intercepts
                        (thresholds/difficulties)
generate_item_responeses_gpcm
                        Internals: calculation of (G)PCM probabilities
                        and drawing responses
generate_item_responses_sml
                        Internals: simulating responding to item in a
                        'simultaneous' way
generate_item_responses_sqn
                        Internals: simulating responding to item in a
                        'sequential' (IRTree) way
generate_slopes         Generating parameters of items - slopes
                        (discrimination)
generate_test_responses
                        Generate simulated data
lnorm_mean              Log-normal distribution parameters
make_item               Creating object representing an item
make_scoring_matrix_aem
                        Make scoring matrix
make_scoring_matrix_trivial
                        Make scoring matrix
make_test               Creating object representing a test
score_on_last_answer_straight
                        Graphical patterns in careless/inattentive
                        responding
