00574nas a2200133 4500008004100000245007700041210006900118260011100187100001000298700001400308700001400322700001100336856009300347 2009 eng d00aLimiting item exposure for target difficulty ranges in a high-stakes CAT0 aLimiting item exposure for target difficulty ranges in a highsta aD. J. Weiss (Ed.), Proceedings of the 2009 GMAC Conference on Computerized Adaptive Testing. {PDF File, 1.1 aLi, X1 aBecker, K1 aGorham, J1 aWoo, A uhttp://iacat.org/content/limiting-item-exposure-target-difficulty-ranges-high-stakes-cat01184nas a2200157 4500008004500000245009300045210006900138300001200207490000600219520062800225100001600853700001900869700001400888700001500902856010900917 2008 Engldsh 00aImpact of altering randomization intervals on precision of measurement and item exposure0 aImpact of altering randomization intervals on precision of measu a160-1670 v93 a
This paper reports on the use of simulation when a randomization procedure is used to control item exposure in a computerized adaptive test for certification. We present a method to determine the optimum width of the interval from which items are selected and we report on the impact of relaxing the interval width on measurement precision and item exposure. Results indicate that, if the item bank is well targeted, it may be possible to widen the randomization interval and thus reduce item exposure, without seriously impacting the error of measure for test takers whose ability estimate is near the pass point.
1 aMuckle, T J1 aBergstrom, B A1 aBecker, K1 aStahl, J A uhttp://iacat.org/content/impact-altering-randomization-intervals-precision-measurement-and-item-exposure