TY - CONF T1 - Impact of item location effects on ability estimation in CAT T2 - Paper presented at the annual meeting of the National Council on Measurement in Education Y1 - 2001 A1 - Liu, M. A1 - Zhu, R. A1 - Guo, F. JF - Paper presented at the annual meeting of the National Council on Measurement in Education CY - Seattle WA N1 - #LI01-01 ER -