check_input_preconditions
                        Check preconditions for an input data frame for
                        the prepare_data_frame and jb_rule_check
                        functions.
dd_hyperbolic_model     This function gets model parameter estimates
                        for each group, including hyperparameters and
                        estimates of the variance components (the
                        observation error and subject random effect).
                        It also gets F-test results for pairwise
                        equality for the hyperparameter for each pair
                        of groups, and overall equality of all
                        hyperparameters.
estimate_hyperbolic_model_params
                        Estimate the hyperparameters for each group, as
                        well as the variance components of the model,
                        using maximum likelihood estimation.
get_subj_est_ln_k       Return ln(k) estimates for each subject.
hyperbolic_model_f_test
                        Perform an F-test for equality of some
                        combination(s) of hyperparameters.
jb_rule_check           Apply Johnson-Bickel rule checks to each
                        subject.
prepare_data_frame      Prepare a data frame containing discounting for
                        use on the other functions in this package.
remedi                  REMEDI data
simulate_dataset        Simulate a dataset from the hierarchical
                        linearized hyperbolic model.
