Primary coding Perceived Stress Scale (PSS) — primary_coding_pop

adds the following column to surveyfrageboge: ecu_pss1,ecu_pss2, ecu_pss3, ecu_pss4, ecu_pss5, ecu_pss6, ecu_pss_total, ecu_pss_cat

primary_coding_pop_pss(trial_data)

Arguments