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1 results

  • Some Improved Diagnostics for Failure of the Rasch Model

  • Ivo W. Molenaar
  • Journal:
    Psychometrika / Volume 48 / Issue 1 / March 1983
    Published online by Cambridge University Press:
    01 January 2025, pp. 49-72

  • Although several goodness of fit tests have been developed for the Rasch model for dichotomous items, most of them are of a global, asymptotic, and confirmatory type. This paper, based on ideas from a recent thesis by Van den Wollenberg, offers some suggestions for local, small sample, and exploratory techniques: difficulty plots for person groups scoring right and wrong on a specific item, a slope test per item based on a binomial distribution per score group, and a unidimensionality check based on an extended hypergeometric distribution per score group.