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JMP for Basic Univariate and Multivariate Statistics, 2nd Edition by R. D. Psych. Norm O'Rourke, Ph. D. Larry Hatcher, Ph. D. Edward J. Stepanski, Ann Lehman

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Assessing Scale Reliability with Coefficient Alpha

Overview

This chapter shows how to use the Multivariate platform in JMP to compute the coefficient alpha reliability index (Cronbach’s alpha) for a multiple-item scale. It reviews basic issues regarding the assessment of reliability, and describes the circumstances under which a measure of internal consistency is likely to be high. Fictitious questionnaire data are analyzed to demonstrate how you can perform an item analysis to improve the reliability of scale responses.

Overview

Introduction: The Basics of Scale Reliability

Example of a Summated Rating Scale

True Scores and Measurement ...

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