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In the bookmark standard-setting procedure, judges place “bookmarks” in a reordered test booklet containing items presented in order of increasing difficulty. Traditionally, the bookmark difficulty location (BDL) is on the trait continuum where, for dichotomous items, there is a two-thirds...
Type I error rates were examined for several fit indices available in GGUM2000: extensions of Infit, Outfit, Andrich’s χ 2 , and the log-likelihood ratio χ 2 . Infit and Outfit had Type I error rates much lower than nominala α. Andrich’s. χ 2 had Type I error rates much higher than...
The problem of finding optimal calibration designs for dichotomous item response theory(IRT) models has been extensively studied in the literature. In this study, this problem will be extended to polytomous IRT models. Focus is given to items described by the nominal response model (NRM). The...
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