Abstract
The influences of item exposure control on the reliability of ability estimation in Multidimensional Computerized Adaptive Testing (MCAT) are investigated by using the empirical data of the 2001 Basic Competency Test (BCTEST) for Junior High School. Three levels of item exposure rate control were manipulated under the long-test and short-test conditions in Between-item Multidimensional Computerized Adaptive Testing (BMCAT). Sympson and Hetter’s (1985) method was applied to control the item exposure rate. The Results show (a) the item exposure rates were successfully controlled, and (b) the reliability of ability estimation was not affected by the item exposure control under the long-test condition, but was reduced a little bit under the long-test condition. Implementation issues in multidimensional adaptive testing are discussed.
| Keywords: | multidimensional item response theory; item exposure control; Rasch model; Bayes estimation |
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