@conference {1259, title = {Optimum number of strata in the a-stratified adaptive testing design}, booktitle = {Paper presented at the annual meeting of the American Educational Research Association}, year = {2002}, note = {{PDF file, 114 KB}}, address = {New Orleans LA}, author = {Wen, J.-B. and Chang, Hua-Hua and Hau, K-T.} } @conference {1258, title = {Adaptation of a-stratified method in variable length computerized adaptive testing}, booktitle = {Paper presented at the annual meeting of the American Educational Research Association}, year = {2001}, note = {{PDF file, 384 KB}}, address = {Seattle WA}, author = {Wen, J.-B. and Chang, Hua-Hua and Hau, K.-T.~} }