TY - JOUR T1 - An examination of exposure control and content balancing restrictions on item selection in CATs using the partial credit model JF - Journal of Applied Measurement Y1 - 2003 A1 - Davis, L. L. A1 - Pastor, D. A. A1 - Dodd, B. G. A1 - Chiang, C. A1 - Fitzpatrick, S. J. KW - *Computers KW - *Educational Measurement KW - *Models, Theoretical KW - Automation KW - Decision Making KW - Humans KW - Reproducibility of Results AB - The purpose of the present investigation was to systematically examine the effectiveness of the Sympson-Hetter technique and rotated content balancing relative to no exposure control and no content rotation conditions in a computerized adaptive testing system (CAT) based on the partial credit model. A series of simulated fixed and variable length CATs were run using two data sets generated to multiple content areas for three sizes of item pools. The 2 (exposure control) X 2 (content rotation) X 2 (test length) X 3 (item pool size) X 2 (data sets) yielded a total of 48 conditions. Results show that while both procedures can be used with no deleterious effect on measurement precision, the gains in exposure control, pool utilization, and item overlap appear quite modest. Difficulties involved with setting the exposure control parameters in small item pools make questionable the utility of the Sympson-Hetter technique with similar item pools. VL - 4 N1 - 1529-7713Journal Article ER - TY - JOUR T1 - A comparison of item selection techniques and exposure control mechanisms in CATs using the generalized partial credit model JF - Applied Psychological Measurement Y1 - 2002 A1 - Pastor, D. A. A1 - Dodd, B. G. A1 - Chang, Hua-Hua KW - (Statistical) KW - Adaptive Testing KW - Algorithms computerized adaptive testing KW - Computer Assisted Testing KW - Item Analysis KW - Item Response Theory KW - Mathematical Modeling AB - The use of more performance items in large-scale testing has led to an increase in the research investigating the use of polytomously scored items in computer adaptive testing (CAT). Because this research has to be complemented with information pertaining to exposure control, the present research investigated the impact of using five different exposure control algorithms in two sized item pools calibrated using the generalized partial credit model. The results of the simulation study indicated that the a-stratified design, in comparison to a no-exposure control condition, could be used to reduce item exposure and overlap, increase pool utilization, and only minorly degrade measurement precision. Use of the more restrictive exposure control algorithms, such as the Sympson-Hetter and conditional Sympson-Hetter, controlled exposure to a greater extent but at the cost of measurement precision. Because convergence of the exposure control parameters was problematic for some of the more restrictive exposure control algorithms, use of the more simplistic exposure control mechanisms, particularly when the test length to item pool size ratio is large, is recommended. (PsycINFO Database Record (c) 2005 APA ) (journal abstract) VL - 26 ER - TY - CONF T1 - An examination of exposure control and content balancing restrictions on item selection in CATs using the partial credit model T2 - Paper presented at the annual meeting of the American Educational Research Association Y1 - 2000 A1 - Davis, L. L. A1 - Pastor, D. A. A1 - Dodd, B. G. A1 - Chiang, C. A1 - Fitzpatrick, S. JF - Paper presented at the annual meeting of the American Educational Research Association CY - New Orleans, LA ER - TY - CONF T1 - Performance of the Sympson-Hetter exposure control algorithm with a polytomous item bank T2 - Paper presented at the annual meeting of American Educational Research Association Y1 - 1999 A1 - Pastor, D. A. A1 - Chiang, C. A1 - Dodd, B. G. A1 - Yockey, R. and JF - Paper presented at the annual meeting of American Educational Research Association CY - Montreal, Canada ER -