6Stocking ML. Three practical issues for modern adaptive testing item pools [M]. Princeton, NJ: Educational Testing Service. 1994, ETS Research Rep. 94-95.
7Downs SM, Marasigan F, Abraham V, et al. Scoring performance on computer-based patient simulations: Beyond value of information [ J ]. Proc AMIA Symp, 1999 (6) :520-524.
8Bickel P, Buyske S, Chang H, et al. One maximizing item information and matching ability with item difficulty[ J ]. Psychometrika, 2001 (66) : 69-77.