TY - CONF T1 - Calibrating CAT pools and online pretest items using nonparametric and adjusted marginal maximum likelihood methods T2 - Paper presented at the annual meeting of the National Council on Measurement in Education Y1 - 2003 A1 - Krass, I. A. A1 - Williams, B. JF - Paper presented at the annual meeting of the National Council on Measurement in Education CY - Chicago IL N1 - PDF file, 128 K ER -