The Effect of Small Calibration Sample Sizes on TOEFL IRT-Based Equating [microform] / K. Linda Tang and Others
- Bib ID:
- 5582765
- Format:
- Book and Microform
- Author:
- Tang, K. Linda
- Online Version:
- https://eric.ed.gov/?id=ED382662
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- Description:
-
- [Washington, D.C.] : Distributed by ERIC Clearinghouse, 1993
- 52 p.
- Summary:
-
This study compared the performance of the LOGIST and BILOG computer programs on item response theory (IRT) based scaling and equating for the Test of English as a Foreign Language (TOEFL) using real and simulated data and two calibration structures. Applications of IRT for the TOEFL program are based on the three-parameter logistic (3PL) model. The results of the study show that item parameter estimates obtained from the smaller real data sample sizes were more consistent with the larger sample estimates when based on BILOG than when based on LOGIST. In addition, the root mean squared error statistics suggest that the BILOG estimates for the item parameters and item characteristic curves were closer in magnitude to the "true" parameter values than were the LOGIST estimates. The equating results based on the parameter estimates suggest that the rule of thumb recommendation that pretest sample sizes be at least 1,000 for LOGIST should be retained if at all possible. Eight tables and 13 figures present results of the analyses. Two appendixes contain specifications and summary statistics. (Contains 15 references.) (Author/SLD)
- Notes:
- May also be available online. Address as at 14/8/18: https://eric.ed.gov/
- Reproduction:
- Microfiche. [Washington D.C.]: ERIC Clearinghouse microfiches : positive.
- Subject:
-
- Comparative Analysis
- Computer Simulation
- Equated Scores
- Estimation (Mathematics)
- Item Response Theory
- Pretests Posttests
- Sample Size
- Scaling
- Simulation
- Test Construction
- BILOG Computer Program
- Calibration Item Parameters LOGIST Computer Program Test of English as a Foreign Language Three Parameter Model
- Genre/Form:
- Reports, Evaluative
- Other authors/contributors:
- Educational Testing Service, Princeton, NJ
- Available From:
- ERIC
- Copyright:
-
In Copyright
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Copyright status was determined using the following information:
- Material type:
- Literary, dramatic or musical work
- Published status:
- Published
- Publication date:
- 1993
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