Wang, S., & Wang, T.. (1999). Precision of Warm's weighted likelihood estimation of ability for a polytomous model in CAT. In Paper presented at the annual meeting of the American Educational Research Association. Montreal.

Wang, S., & Wang, T.. (2002). Relative precision of ability estimation in polytomous CAT: A comparison under the generalized partial credit model and graded response model. In Paper presented at the annual meeting of the American Educational Research Association. New Orleans LA.

Wang, S. (1999). The precision of ability estimation methods for computerized adaptive testing using the generalized partial credit model. Unpublished doctoral dissertation, University of Pittsburgh.