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Tolerable Variation in Item Parameter Estimates for Linear and Adaptive Computer-based Testing CAT IRT

Author(s):
Rizavi, Saba; Way, Walter D.; Davey, Tim; Herbert, Erin
Publication Year:
2004
Report Number:
RR-04-28
Source:
ETS Research Report
Document Type:
Report
Page Count:
36
Subject/Key Words:
Item Parameter Estimation, Computerized Adaptive Testing (CAT), Item Response Theory (IRT), Scoring

Abstract

Similar findings with adaptively administered items in another high stakes testing program were also found when initial adaptively based item parameter estimates were compared with estimates from repeated use. The results of this study also indicated that context effects played a more significant role in adaptive item parameters when the comparisons were made to the parameters that were initially obtained from linear paper-and-pencil testing.

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