Abstract
Due to previous exposure of items in adaptive testing, items may become known to a substantial portion of examinees. A disclosed item is bound to show drift in the item parameter values. In this paper it is suggested to use a statistical quality control method for the detection of known items. The method is worked out in detail for the 1-PL and 3-PL models. Adaptive test data are used to re-estimate the item parameters, and these estimates are used in a test of parameter drift. The method is illustrated in a number of simulation studies, including a power study.
| Original language | English |
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| Pages (from-to) | 373-391 |
| Number of pages | 18 |
| Journal | Journal of educational and behavioral statistics |
| Volume | 23 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2000 |