Bartolucci, FrancescoBacci, Silvia2018-12-102024-04-222018-12-102024-04-222016978-1-4665-6850-1https://drs.ess.gov.et/handle/12345678/29046enTheory Models PolytomousStatistical Analysis of Questionnaires:A Unified Approach Based on R and StataBook