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Concurrent Calibration of Dichotomously and Polytomously Scored TOEFL Items Using IRT Models IRT TOEFL

Tang, K. Linda; Eignor, Daniel R.
Publication Year:
Report Number:
RR-97-06, TOEFL-TR-13
ETS Research Report
Document Type:
Page Count:
Subject/Key Words:
Calibration, Dichotomous Items, English (Second Language), Item Response Models, Item Response Theory (IRT), Polytomous Items, TOEFL 2000, Test of English as a Foreign Language (TOEFL)


In a similar fashion, data for a listening/speaking combination made up of the TOEFL Listening Comprehension section and selected tasks from the TSE were also reasonably well fit by the 3PL/generalized partial credit and 3PL/graded response model combinations. A variety of comparisons across the generalized partial credit and graded response models seem to indicate some preference for using the generalized partial credit model when PARSCALE is used as the calibration program. The results of this study provide useful information about test construction and item calibration procedures that might later be used for the TOEFL 2000 project.

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