Examination of the scale structure of the Moorong Self-Efficacy Scale: Application of Rasch Measurement theory

Thursday, November 10, 2022

3:15 PM – 3:31 PM

Presenting Author(s)

Allan J. Kozlowski, PhD, B.Sc. (PT)

Consultant
Mary Free Bed Rehabilitation Hospital
Grand Rapids, Michigan, United States

Slides Slides and Audio
Jennifer Weaver, PhD, OTR/L, CBIS

Assistant Professor
Colorado State University
Fort Collins, Colorado, United States

Non-presenting Author(s)

Trudy Mallinson, PhD

Associate Dean for Health Sciences Research
The George Washington University
Frederick, Maryland, United States
CG

Cally Gooch

Business Intelligence & Informatics Assistant
Mary Free Bed Rehabilitation Hospital, Michigan, United States
RH

Rachel Hren

Business Intelligence Developer Analyst
Mary Free Bed Rehabilitation Hospital, United States
Michelle A. Meade, PhD (she/her/hers)

Professor
University of Michigan
Ann Arbor, Michigan, United States
John F. Butzer

Director of Research Emeritus
Mary Free Bed Rehabilitation Hospital
Grand Rapids, Michigan, United States

The Moorong Self-Efficacy Scale (MSES) is commonly used to measure self-efficacy for persons living with spinal cord injury (SCI). We applied the Rasch Measurement Model to scores of 79 participants in a randomized controlled trial on exercise to conduct an exploratory examination of the reproducibility, conceptual/content validation, and structural validity of the MSES. We addressed item misfit, infrequent category endorsement, and category step disorder by removing two items and reorganizing the rating scale. The resulting 14-item Rasch MSES (MSES-14R) scale exhibited minimal evidence of dimensionality but was poorly targeted to our sample. The MSES-14R addressed measurement error inherent in the original MSES but is limited by small sample size and warrants further investigation with larger and more diverse samples.

Learning Objectives:

Describe the item structure and response scale structure of the Moorong Self-Efficacy Scale in context of the Rasch Measurement model
Compare and contrast the 14-item Rasch 0-100 scaled version of the Moorong Self-Efficacy Scale to the item content and subscale structure of the original classical test theory-based version
Discuss the strengths and limitations of applying the 14-item Rasch 0-100 scaled version of the Moorong Self-Efficacy Scale to clinical and research measurement applications