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Abdel-fattah, Abdel-fattah A.1
Monaco, Malina1
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A Monte Carlo Study of Skewed Theta Distributions on DIF Indices.
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Monaco, Malina – 1997
The effects of skewed theta distributions on indices of differential item functioning (DIF) were studied, comparing Mantel Haenszel (N. Mantel and W. Haenszel, 1959) and DFIT (N. S. Raju, W. J. van der Linden, and P. F. Fleer) (noncompensatory DIF). The significance of the study is that in educational and psychological data, the distributions one…
Descriptors: Ability, Estimation (Mathematics), Item Bias, Monte Carlo Methods
Comparing BILOG and LOGIST Estimates for Normal, Truncated Normal, and Beta Ability Distributions.
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Abdel-fattah, Abdel-fattah A. – 1994
The accuracy of estimation procedures in item response theory was studied using Monte Carlo methods and varying sample size, number of subjects, and distribution of ability parameters for: (1) joint maximum likelihood as implemented in the computer program LOGIST; (2) marginal maximum likelihood; and (3) marginal Bayesian procedures as implemented…
Descriptors: Ability, Bayesian Statistics, Estimation (Mathematics), Maximum Likelihood Statistics