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Ordering Individuals with Sum Scores: The Introduction of the Nonparametric Rasch Model

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  • Robert J. Zwitser

    (University of Amsterdam)

  • Gunter Maris

    (University of Amsterdam
    Cito Institute for Educational Measurement)

Abstract

When a simple sum or number-correct score is used to evaluate the ability of individual testees, then, from an accountability perspective, the inferences based on the sum score should be the same as the inferences based on the complete response pattern. This requirement is fulfilled if the sum score is a sufficient statistic for the parameter of a unidimensional model. However, the models for which this holds true are known to be restrictive. It is shown that the less restrictive nonparametric models could result in an ordering of persons that is different from an ordering based on the sum score. To arrive at a fair evaluation of ability with a simple number-correct score, ordinal sufficiency is defined as a minimum condition for scoring. The monotone homogeneity model, together with the property of ordinal sufficiency of the sum score, is introduced as the nonparametric Rasch model. A basic outline for testable hypotheses about ordinal sufficiency, as well as illustrations with real data, is provided.

Suggested Citation

  • Robert J. Zwitser & Gunter Maris, 2016. "Ordering Individuals with Sum Scores: The Introduction of the Nonparametric Rasch Model," Psychometrika, Springer;The Psychometric Society, vol. 81(1), pages 39-59, March.
    • Handle: RePEc:spr:psycho:v:81:y:2016:i:1:d:10.1007_s11336-015-9481-x
    DOI: 10.1007/s11336-015-9481-x
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    References listed on IDEAS

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