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1 results

  • A Similarity-Based Smoothing Approach to Nondimensional Item Analysis

  • J. O. Ramsay
  • Journal:
    Psychometrika / Volume 60 / Issue 3 / September 1995
    Published online by Cambridge University Press:
    01 January 2025, pp. 323-339

  • The probability that an examinee chooses a particular option within an item is estimated by averaging over the responses to that item of examinees with similar response patterns for the whole test. The approach does not presume any latent variable structure or any dimensionality. But simulated and actual data analyses are presented to show that when the responses are determined by a latent ability variable, this similarity-based smoothing procedure can reveal the dimensionality of ability very satisfactorily.