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Straat, J. Hendrik1
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van der Ark, L. Andries1
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Minimum Sample Size Requirements for Mokken Scale Analysis
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Straat, J. Hendrik; van der Ark, L. Andries; Sijtsma, Klaas – Educational and Psychological Measurement, 2014
An automated item selection procedure in Mokken scale analysis partitions a set of items into one or more Mokken scales, if the data allow. Two algorithms are available that pursue the same goal of selecting Mokken scales of maximum length: Mokken's original automated item selection procedure (AISP) and a genetic algorithm (GA). Minimum…
Descriptors: Sampling, Test Items, Effect Size, Scaling
Estimates of the Sampling Distribution of Scalability Coefficient H
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Van Onna, Marieke J. H. – Applied Psychological Measurement, 2004
Coefficient "H" is used as an index of scalability in nonparametric item response theory (NIRT). It indicates the degree to which a set of items rank orders examinees. Theoretical sampling distributions, however, have only been derived asymptotically and only under restrictive conditions. Bootstrap methods offer an alternative possibility to…
Descriptors: Sampling, Item Response Theory, Scaling, Comparative Analysis