Adaptive Testing With Regression Trees in the Presence of Multidimensionality

Author:

Yan Duanli1,Lewis Charles1,Stocking Martha1

Affiliation:

1. Educational Testing Service

Abstract

It is unrealistic to suppose that standard item response theory (IRT) models will be appropriate for all the new and currently considered computer-based tests. In addition to developing new models, we also need to give attention to the possibility of constructing and analyzing new tests without the aid of strong models. Computerized adaptive testing currently relies heavily on IRT. Alternative, empirically based, nonparametric adaptive testing algorithms exist, but their properties are little known. This article introduces a nonparametric, tree-based algorithm for adaptive testing and shows that it may be superior to conventional, IRT-based adaptive testing in cases where the IRT assumptions are not satisfied. In particular, it shows that the tree-based approach clearly outperformed (one-dimensional) IRT when the pool was strongly two-dimensional.

Publisher

American Educational Research Association (AERA)

Subject

Social Sciences (miscellaneous),Education

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