Submitted by zhenli on Thu, 01/24/2019 - 14:28
| Title | A Continuous a-Stratification Index for Item Exposure Control in Computerized Adaptive Testing |
| Publication Type | Journal Article |
| Year of Publication | 2018 |
| Authors | Huebner, A, Wang, C, Daly, B, Pinkelman, C |
| Journal | Applied Psychological Measurement |
| Volume | 42 |
| Number | 7 |
| Pagination | 523-537 |
| Abstract | The method of a-stratification aims to reduce item overexposure in computerized adaptive testing, as items that are administered at very high rates may threaten the validity of test scores. In existing methods of a-stratification, the item bank is partitioned into a fixed number of nonoverlapping strata according to the items’a, or discrimination, parameters. This article introduces a continuous a-stratification index which incorporates exposure control into the item selection index itself and thus eliminates the need for fixed discrete strata. The new continuous a-stratification index is compared with existing stratification methods via simulation studies in terms of ability estimation bias, mean squared error, and control of item exposure rates. |
| URL | https://doi.org/10.1177/0146621618758289 |
| DOI | 10.1177/0146621618758289 |