Using a Rasch Analysis to Refine a Musicians’ Self-Efficacy to Maintain Practice Schedules Scale

• In Event: Measurement Issues in Survey Research

Abstract

The purpose of this study was to analyze the psychometric properties of the researcher-designed Self-Efficacy to Maintain Practice Schedules Scale using both Classical Test Theory (CTT) and the Rasch model to validate and refine the scale. Results of a CTT analysis, including a measure of internal consistency and a factor analysis, provided evidence of unidimensionality. An initial Rasch analysis, however, highlighted two measurement flaws. Using the results of this analysis, the instrument was revised to remove three misfitting items and to reduce the number of response options. After revisions, follow-up analysis was conducted, and the instrument demonstrated improved psychometric properties. Implications are discussed for researchers who work with rating scale data.

Authors

• D. Gregory Springer, University of South Carolina

• Joanne P. Rojas

• Kelly D. Bradley, University of Kentucky