Journal of the Royal Statistical Society. Series D (The Statistician), Vol. 43, No. 2 (1994), pp. 223-230 (8 pages) Pelz and Good showed how several methods of estimating cell probabilities in ...

In latent trait models, correct response probabilties are compared conditional on latent ability; in Scheuneman's (1979) method these probabilities are compared conditional on the observed test score.