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Simulated Equating Using Several Item Response Curves TOEFL

Author(s):
Boldt, Robert F.
Publication Year:
1994
Report Number:
RR-93-57, TOEFL-TR-08
Source:
ETS Research Report
Document Type:
Report
Page Count:
27
Subject/Key Words:
Equated Scores, Item Response Models, Simulation, Test of English as a Foreign Language (TOEFL)

Abstract

Imposing an upper bound on the probability of correct response in the simple model markedly reduced its errors. TOEFL scores are used for educational decisions. If it is true that most institutions' cut-scores occur in the mid-score ranges, the present study suggests that 3PL should not be used if equating samples are substantially reduced from the present size. The other models are promising for small-sample equating, with the one-parameter logistic models being most promising.

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