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Conditional Covariance Theory and DETECT for Polytomous Items IRT DETECT NAEP

Author(s):
Zhang, Jinming
Publication Year:
2004
Report Number:
RR-04-50
Source:
ETS Research Report
Document Type:
Report
Page Count:
43
Subject/Key Words:
Item Response Theory (IRT), Multidimensional Item Response Theory (MIRT), Dimensionality, Multidimensionality, Approximate Simple Structure, Cluster Analysis, Dimensionality Evaluation To Enumerate Contributing Traits (DETECT), Polytomous Items, National Assessment of Educational Progress (NAEP)

Abstract

DETECT is then applied to analyze the dimensional structure of the 2002 NAEP reading samples of grades 4 and 8. The DETECT results show that the substantive test structure based on the purposes for reading is consistent with the statistical dimensional structure for either grade. The results also indicate that the degree of multidimensionality of the NAEP reading data is weak.

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