An IRT Scale Transformation Method for Parameters Calibrated from Multiple Samples of Subjects. ACT Research Report Series 96-2 [electronic resource] / Lingjia Zeng.
A problem frequently confronted in item response theory (IRT) applications is that the item parameters calibrated using more than two independent samples of subjects must be expressed on the same scale. The existing methods were developed for a pairwise transformation, that is, from one scale to the...
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| Language: | English |
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Distributed by ERIC Clearinghouse,
1996.
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MARC
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| 100 | 1 | |a Zeng, Lingjia. | |
| 245 | 1 | 3 | |a An IRT Scale Transformation Method for Parameters Calibrated from Multiple Samples of Subjects. ACT Research Report Series 96-2 |h [electronic resource] / |c Lingjia Zeng. |
| 260 | |a [S.l.] : |b Distributed by ERIC Clearinghouse, |c 1996. | ||
| 300 | |a 19 p. | ||
| 500 | |a ERIC Document Number: ED410268. | ||
| 500 | |a Availability: ACT Research Report Series, P.O. Box 168, Iowa City, IA 52243-0168. |5 ericd. | ||
| 520 | |a A problem frequently confronted in item response theory (IRT) applications is that the item parameters calibrated using more than two independent samples of subjects must be expressed on the same scale. The existing methods were developed for a pairwise transformation, that is, from one scale to the other. The purpose of this study is to introduce a common scale transformation method that can simultaneously find a vector of transformation functions for placing the parameter estimated from two or more item pools on a specified common scale. Two examples are presented to illustrate the usefulness of the method. The first is from 2 forms of a mathematics test administered to nonequivalent groups of examinees (1,637 and 1,636 examinees). The second used the item parameter estimates of the 11 common items for the first item pool of the first study. The proposed common scale transformation method provides an alternative approach for solving the problem of incompatible IRT-parameter estimates calibrated with two or more independent samples of subjects. (Contains 2 tables and 11 references.) (Author/SLD) | ||
| 650 | 1 | 7 | |a Estimation (Mathematics) |2 ericd. |
| 650 | 1 | 7 | |a Item Response Theory. |2 ericd. |
| 650 | 0 | 7 | |a Mathematics Tests. |2 ericd. |
| 650 | 1 | 7 | |a Scaling. |2 ericd. |
| 650 | 1 | 7 | |a Test Items. |2 ericd. |
| 710 | 2 | |a American College Testing Program. | |
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