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Estimating Diffusion-Based Item Response Theory Models: Exploring the Robustness of Three Old and Two New Estimators

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  • Jochen Ranger

    (Martin-Luther-University Halle-Wittenberg)

  • Jörg-Tobias Kuhn

    (University of Dortmund)

Abstract

Diffusion-based item response theory models for responses and response times in tests have attracted increased attention recently in psychometrics. Analyzing response time data, however, is delicate as response times are often contaminated by unusual observations. This can have serious effects on the validity of statistical inference. In this article, we compare three established and two new estimation approaches for diffusion-based item response theory models with respect to their robustness. The three established approaches are the marginal maximum likelihood (ML) estimator for continuous time, the marginal ML estimator for discrete time, and the weighted least squares (WLS) estimator. The new approaches are two modifications of the WLS estimator with better robustness properties. The performance of the estimators is compared in a simulation study. The simulation study illustrates that the new approaches are robust against some forms of random independent contamination. The marginal ML estimator for discrete time also performs well. The marginal ML estimator for continuous time is heavily affected by contamination.

Suggested Citation

  • Jochen Ranger & Jörg-Tobias Kuhn, 2018. "Estimating Diffusion-Based Item Response Theory Models: Exploring the Robustness of Three Old and Two New Estimators," Journal of Educational and Behavioral Statistics, , vol. 43(6), pages 635-662, December.
    • Handle: RePEc:sae:jedbes:v:43:y:2018:i:6:p:635-662
    DOI: 10.3102/1076998618787791
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    References listed on IDEAS

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