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Educational and Psychological Measurement
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WPerfit: A Program for Computing parametric Person-Fit Statistics and Plotting Person Response Curves

Pere J. Ferrando

pjfp{at}astor.urv.es.

Urbano Lorenzo

Rovira i Virgili University, Spain

A program is described for computing different person-fit measures under different parametric item response models for binary items. The indices computed are the standardized log-likelihood index lz, the standardized extended caution index ECI4z, and the chi-square statistic of Trabin and Weiss. These indices can be computed for the Rasch model and the two- and three-parameter logistic models. The program can plot person response curves, which allow the researcher to investigate the kind of nonfitting response behavior that is present in examinees who are detected as inconsistent.

Educational and Psychological Measurement, Vol. 60, No. 3, 479-487 (2000)
DOI: 10.1177/00131640021970547
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