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After analyzing data from the 1990 National Assessment of Educational Progress Trial State Assessment, we question whether person-fit statistics are useful in the analysis and reporting of results from psychometrically strong achievement tests. Using a weighted mean-square person-fit statistic, we examined the distribution of fit across individuals, looked for group and item-type differences, and investigated practical significance. In each analysis, we found that this person-fit statistic did not provide any additional information.
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Rudner et al. (1996) studied this question.
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