Behavior of descriptive fit indexes in confirmatory factor analysis using ordered categorical data

Abstract

The purpose of this study was to examine the behavior of 8 measures of fit used to evaluate confirmatory factor analysis models. This study employed Monte Carlo simulation to determine to what extent sample size, model size, estimation procedure, and level of nonnormality affected fit when polytomous data were analyzed. The 3 indexes least affected by the design conditions were the comparative fit index, incremental fit index, and nonnormed fit index, which were affected only by level of nonnormality. The measure of centrality was most affected by the design variables, with values of n2>. 10 for sample size, model size, and level of nonnormality and interaction effects for Model Size x Level of Nonnormality and Estimation x Level of Nonnormality. Findings from this study should alert applied researchers to exercise caution when evaluating model fit with nonnormal, polytomous data.

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