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Educational and Psychological…2
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An Approach to Ancova that Allows Multiple Covariates, Nonlinearity, and Heteroscedasticity
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Wilcox, Rand R. – Educational and Psychological Measurement, 2005
It is known that nonnormality, a heteroscedastic error term, or a nonlinear association can create serious practical problems when using the conventional analysis of covariance (ANCOVA) method. This article describes a simple ANCOVA method that allows heteroscedasticity, nonnormality, nonlinearity, and multiple covariates. When standard…
Descriptors: Statistical Analysis, Error of Measurement, Measurement Techniques
The Single Administration Estimate of the Proportion of Agreement of a Proficiency Test Scored with a Latent Structure Model.
Peer reviewed Peer reviewed
Wilcox, Rand R. – Educational and Psychological Measurement, 1981
This paper describes and compares procedures for estimating the reliability of proficiency tests that are scored with latent structure models. Results suggest that the predictive estimate is the most accurate of the procedures. (Author/BW)
Descriptors: Criterion Referenced Tests, Scoring, Test Reliability