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Multiple Group IRT

  • R. Darrell Bock
  • Michele F. Zimowski
Chapter

Abstract

The extension of item response theory to data from more than one group of persons offers a unified approach to such problems as differential item functioning, item parameter drift, nonequivalent groups equating, vertical equating, two-stage testing, and matrix-sampled educational assessment. The common element in these problems is the existence of persons from different populations responding to the same test or to tests containing common items. In differential item functioning, the populations typically correspond to sex or demographic groups; in item parameter drift, to annual cohorts of students; in vertical equating, to children grouped by age or grade; in nonequivalent groups equating, to normative samples from different places or times; in two-stage testing, to examinees classified by levels of performance on a pretest; and in matrix-sampled educational assessment, to students from different schools or programs administered matrix-sampled assessment instruments. In all these settings, the objective of the multiplegroup analysis is to estimate jointly the item parameters and the latent distribution of a common attribute or ability of the persons in each of the populations.

Keywords

Differential Item Functioning Latent Distribution Item Response Theory Item Parameter Item Response Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1997

Authors and Affiliations

  • R. Darrell Bock
  • Michele F. Zimowski

There are no affiliations available

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