TY - JOUR T1 - Increasing the homogeneity of CAT's item-exposure rates by minimizing or maximizing varied target functions while assembling shadow tests JF - Journal of Educational Measurement Y1 - 2005 A1 - Li, Y. H. A1 - Schafer, W. D. KW - algorithm KW - computerized adaptive testing KW - item exposure rate KW - shadow test KW - varied target function AB - A computerized adaptive testing (CAT) algorithm that has the potential to increase the homogeneity of CATs item-exposure rates without significantly sacrificing the precision of ability estimates was proposed and assessed in the shadow-test (van der Linden & Reese, 1998) CAT context. This CAT algorithm was formed by a combination of maximizing or minimizing varied target functions while assembling shadow tests. There were four target functions to be separately used in the first, second, third, and fourth quarter test of CAT. The elements to be used in the four functions were associated with (a) a random number assigned to each item, (b) the absolute difference between an examinee's current ability estimate and an item difficulty, (c) the absolute difference between an examinee's current ability estimate and an optimum item difficulty, and (d) item information. The results indicated that this combined CAT fully utilized all the items in the pool, reduced the maximum exposure rates, and achieved more homogeneous exposure rates. Moreover, its precision in recovering ability estimates was similar to that of the maximum item-information method. The combined CAT method resulted in the best overall results compared with the other individual CAT item-selection methods. The findings from the combined CAT are encouraging. Future uses are discussed. (PsycINFO Database Record (c) 2007 APA, all rights reserved) PB - Blackwell Publishing: United Kingdom VL - 42 SN - 0022-0655 (Print) ER - TY - CONF T1 - The context effects of multidimensional CAT on the accuracy of multidimensional abilities and the item exposure rates T2 - Paper presented at the annual meeting of the American Educational Research Association Y1 - 2004 A1 - Li, Y. H. A1 - Schafer, W. D. JF - Paper presented at the annual meeting of the American Educational Research Association CY - San Diego CA N1 - {Incomplete PDF file, 202 KB} ER - TY - CONF T1 - Accuracy of reading and mathematics ability estimates under the shadow-test constraint MCAT T2 - Paper presented at the annual meeting of the American Educational Research Association Y1 - 2003 A1 - Li, Y. H. A1 - Schafer, W. D. JF - Paper presented at the annual meeting of the American Educational Research Association CY - Chicago IL ER - TY - CONF T1 - The effect of item selection method on the variability of CAT’s ability estimates when item parameters are contaminated with measurement errors T2 - Paper presented at the Annual meeting of the National Council on Measurement in Education Y1 - 2003 A1 - Li, Y. H. A1 - Schafer, W. D. JF - Paper presented at the Annual meeting of the National Council on Measurement in Education CY - Chicago IL N1 - {PDF file, 275 KB} ER - TY - CONF T1 - Increasing the homogeneity of CAT’s item-exposure rates by minimizing or maximizing varied target functions while assembling shadow tests T2 - Paper presented at the annual meeting of the American Educational Research Association Y1 - 2003 A1 - Li, Y. H. A1 - Schafer, W. D. JF - Paper presented at the annual meeting of the American Educational Research Association CY - Chicago IL N1 - (PDF file, 418 K ER - TY - CONF T1 - Multidimensional computerized adaptive testing in recovering reading and mathematics abilities T2 - Paper presented at the annual meeting of the American Educational Research Association Y1 - 2003 A1 - Li, Y. H. A1 - Schafer, W. D. JF - Paper presented at the annual meeting of the American Educational Research Association CY - Chicago, IL N1 - {PDF file, 592 KB} ER -