analyze_best_six_symptoms_four_required
                        Find optimal non-hierarchical six-symptom
                        combinations for PTSD diagnosis
analyze_best_six_symptoms_four_required_clusters
                        Find optimal hierarchical six-symptom
                        combinations for PTSD diagnosis
binarize_data           Binarize PCL-5 symptom scores
calculate_ptsd_total    Calculate PTSD total score
create_ptsd_diagnosis_binarized
                        Determine PTSD diagnosis based on DSM-5
                        criteria using binarized scores
create_ptsd_diagnosis_nonbinarized
                        Determine PTSD diagnosis based on DSM-5
                        criteria using non-binarized scores
create_readable_summary
                        Create readable summary of PTSD diagnostic
                        changes
cross_validation        Perform k-fold cross-validation for PTSD
                        diagnostic models
holdout_validation      Perform holdout validation for PTSD diagnostic
                        models
rename_ptsd_columns     Rename PTSD symptom (= PCL-5 item) columns
simulated_ptsd          Simulated PCL-5 (PTSD Checklist) Data
summarize_ptsd          Summarize PTSD scores and diagnoses
summarize_ptsd_changes
                        Summarize changes in PTSD diagnostic metrics
