Improving Measurement Precision of Test Batteries Using Multidimensional Item Response Models

Wen Chung Wang, Po Hsi Chen, Ying Yao Cheng

Research output: Contribution to journalReview articlepeer-review

88 Citations (Scopus)


A conventional way to analyze item responses in multiple tests is to apply unidimensional item response models separately, one test at a time. This unidimensional approach, which ignores the correlations between latent traits, yields imprecise measures when tests are short. To resolve this problem, one can use multidimensional item response models that use correlations between latent traits to improve measurement precision of individual latent traits. The improvements are demonstrated using 2 empirical examples. It appears that the multidimensional approach improves measurement precision substantially, especially when tests are short and the number of tests is large. To achieve the same measurement precision, the multidimensional approach needs less than half of the comparable items required for the unidimensional approach.

Original languageEnglish
Pages (from-to)116-136
Number of pages21
JournalPsychological Methods
Issue number1
Publication statusPublished - 2004 Mar

ASJC Scopus subject areas

  • Psychology (miscellaneous)

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