The Problem With Cronbach’s Alpha

Claudio Barbaranelli · C S Lee · Ercole Vellone · Barbara J. Riegel

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Psychometric Methodologies and Testing Health Education and Validation Reliability and Agreement in Measurement

Abstract

Knowledge of a scale's dimensionality is an essential preliminary step to the application of any measure of reliability derived from classical test theory--an approach commonly used is nursing research. The focus of this article is on the applied aspects of reliability and dimensionality testing. Throughout the article, the Self-Care of Heart Failure Index is used to exemplify real-world data challenges of quantifying reliability and to provide insight into how to overcome such challenges.

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1981Evaluating Structural Equation Models with Unobservable Variables and Measurement Error 2004An Empirical Evaluation of Alternative Methods of Estimation for Confirmatory Factor Analysis With Ordinal Data.2008On the Use, the Misuse, and the Very Limited Usefulness of Cronbach’s Alpha 2009An Update on the Self-care of Heart Failure Index 1997Scale Reliability, Cronbach's Coefficient Alpha, and Violations of Essential Tau-Equivalence with Fixed Congeneric Components 2008Alpha, Dimension-Free, and Model-Based Internal Consistency Reliability 2004Psychometric testing of the self-care of heart failure index

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