a-Stratified Multistage Computerized Adaptive Testing with b Blocking
- 1 December 2001
- journal article
- research article
- Published by SAGE Publications in Applied Psychological Measurement
- Vol. 25 (4) , 333-341
- https://doi.org/10.1177/01466210122032181
Abstract
Chang & Ying’s (1999) computerized adaptive testing item-selection procedure stratifies the item bank according to a parameter values and requires b parameter values to be evenly distributed across all strata. Thus, a and b parameter values must be incorporated into how strata are formed. A refinement is proposed, based on Weiss’ (1973) stratification of items according to b values. Simulation studies using a retired item bank of a Graduate Record Examination test indicate that the new approach improved control of item exposure rates and reduced mean squared errors.Keywords
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