![]() Confirmatory factor analysis is limited to the common factor model for congeneric, tau-equivalent, and parallel measures. DIF effect sizes and ETS DIF classifications are included in the output. ![]() The DIF analysis is based on nonparametric item characteristic curves and the Mantel-Haenszel procedure. Reliability coefficients include Cronbach's alpha, Guttman's lambda, the Feldt-Gilmer Coefficient, the Feldt-Brennan coefficient, decision consistency indices, the conditional standard error of measurement, and reliability if item deleted. The item analysis includes proportion, point biserial, and biserial statistics for all response options. Current methods include classical item analysis, differential item functioning (DIF) analysis, confirmatory factor analysis, item response theory, IRT equating, and nonparametric item response theory. Patrick Meyer at the University of Virginia. ![]() JMetrik is free and open source software for conducting a comprehensive psychometric analysis. ![]()
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