Item response theory for items scored in more than two categories

Citation

Thissen, D., Nelson, L., Rosa, K., & Mcleod, L.D. (2001). Item response theory for items scored in more than two categories. In Thissen, D. & Wainer, H. (Eds.), Test Scoring (pp. 141-186). Mahwah, NJ: Lawrence Erlbaum Associates.

Abstract