evaluate_model_cox      Evaluate model with cutoffs Evaluates the model
                        by creating exposure variables based on the
                        cutoffs and fitting a Cox model.
evaluate_model_logistic
                        Evaluate logistic regression model with cutoffs
find_best_combination_cox
                        Find best combination of cutoffs Searches for
                        the best combination of cutoffs that minimizes
                        the Akaike Information Criterion (AIC).
find_best_combination_logistic
                        Find best combination of cutoffs for logistic
                        regression
find_cutoffs_cox        Find symmetric cutoffs This function finds
                        symmetric cutoff points for a specified
                        variable using Cox regression.
find_cutoffs_logistic   Find symmetric cutoffs for logistic regression
rgs_for_cox             Main function for cox regression analysis
                        Performs regression analysis to identify
                        optimal cutoffs and evaluate the model. Users
                        are required to create and set the datadist
                        option globally before using this function.
rgs_for_logistic        Main function for logistic regression analysis
test_ushape_cox         Test U-shape relationship This function checks
                        for a U-shaped relationship between survival
                        time and a set of variables. Users are required
                        to create and set the datadist option globally
                        before using this function.
test_ushape_logistic    Test U-shape relationship in logistic
                        regression
