Authors: Ip, EH

Citation: Eh. Ip, Testing for local dependency in dichotomous and polytomous item response models, PSYCHOMETRI, 66(1), 2001, pp. 109-132

Authors: Ip, EH Lalwani, N

Citation: Eh. Ip et N. Lalwani, A note on the geometric interpretation of the EM algorithm in estimating item characteristics and student abilities, PSYCHOMETRI, 65(4), 2000, pp. 533-537