## Center for Educational Assessment, University of Missouri, 1988: Psychometric Item Response Analysis

MLE's of item and ability parameters of two and three parameter latent trait model, were found via the EM algorithm, from the first-time College-Base'' test data, which helped started forming a question-bank (items with {\em known} difficulty parameters) as well. Two specialized softwares called BILOG and LOGIST were used for the purpose.