01302nas a2200133   4500008003900000245008200039210006900121300001200190490000700202520085800209100001901067700002501086856005701111       2004                          d00aConstraining Item Exposure in Computerized Adaptive Testing With Shadow Tests0 aConstraining Item Exposure in Computerized Adaptive Testing With  a273-2910 v293 a<p>Item-exposure control in computerized adaptive testing is implemented by imposing item-ineligibility constraints on the assembly process of the shadow tests. The method resembles Sympson and Hetter&rsquo;s (1985) method of item-exposure control in that the decisions to impose the constraints are probabilistic. The method does not, however, require time-consuming simulation studies to set values for control parameters before the operational use of the test. Instead, it can set the probabilities of item ineligibility adaptively during the test using the actual item-exposure rates. An empirical study using an item pool from the Law School Admission Test showed that application of the method yielded perfect control of the item-exposure rates and had negligible impact on the bias and mean-squared error functions of the ability estimator.</p>
1 aLinden, Wim, J1 aVeldkamp, Bernard, P  uhttp://jeb.sagepub.com/cgi/content/abstract/29/3/273