Beyond internal consistency reliability: Rationale and user’s guide for Multitrait Analysis Program on the microcomputer

Abstract

A methodology for evaluating Likert-type scales is presented. Multitrait scaling is a straightforward approach to scale analysis that focuses on items as the unit of analysis and utilizes the logic of convergent and discriminant validity. Multitrait scaling is illustrated with the Multitrait Analysis Program, using patient satisfaction data from the Medical Outcomes Study.

Preparation of this article was supported by a grant from the RAND Corporation as part of its program of public service. The opinions expressed are those of the authors and do not necessarily reflect the views of the RAND Corporation or the California State Assembly Office of Research.