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Applied Psychological…2
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Boss, Marvin W.1
Williams, Richard H.1
Zimmerman, Donald W.1
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Restriction of Range and Correlation in Outlier-Prone Distributions.
Peer reviewed Peer reviewed
Zimmerman, Donald W.; Williams, Richard H. – Applied Psychological Measurement, 2000
Restricted the range of nonnormal distributions by eliminating scores above a designated cutoff value or eliminating scores above or below the mean by a certain distance. Results of a simulation study show that range restriction sometimes increased the correlation between variables having outlier prone distributions. Discusses practical…
Descriptors: Correlation, Scores, Simulation, Statistical Distributions
The Effects on Parameter Estimation of Correlated Dimensions and a Distribution-Restricted Trait in a Multidimensional Item Response Model.
Peer reviewed Peer reviewed
Batley, Rose-Marie; Boss, Marvin W. – Applied Psychological Measurement, 1993
The adequacy of multidimensional trait and item parameters using multidimensional item response theory analysis was studied through simulation using different degrees of correlation between two trait dimensions and the existence of a restricted trait on the second dimension. Conditions allowing adequate recovery of trait and item parameters are…
Descriptors: Computer Simulation, Correlation, Equations (Mathematics), Estimation (Mathematics)