ERIC Number: ED411269
Record Type: Non-Journal
Publication Date: 1997-Mar
Reference Count: N/A
An Empirical Comparison of Two LISREL Chi-Square Goodness-of-Fit Statistics and the Implications for Dimensionality Assessment of Item Response Data.
De Champlain, Andre F.; Gessaroli, Marc E.
A study was conducted to compare, with simulated unidimensional and two-dimensional sets, the Type I error probabilities and rejection rates obtained with two versions of the LISREL computer program, the earlier version PRELIS/LISREL 7 and the later version PRELIS2/LISREL8, a version that corrects the asymptotic covariance matrix. Unidimensional data sets were generated according to sample sizes of 2,500 and 5,000 and test lengths of 10 and 20 items. Two-dimensional item response vectors were generated for the same sample sizes and test lengths. Findings with unidimensional data sets suggest that the correction in PRELIS2 resulted in higher Type I error rates with the chi-square goodness-of-fit statistic. Rejection rates obtained using the LISREL8 chi-square fit statistic were high across all simulated two dimensional conditions. Results suggest that the LISREL7 chi-square fit statistic should be recommended to the researcher interested in determining whether the assumption of unidimensionality has been violated. (Contains 2 tables and 29 references.) (SLD)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Authoring Institution: N/A