@article {56,
	title = {a-Stratified multistage computerized adaptive testing with b blocking},
	journal = {Applied Psychological Measurement},
	volume = {25},
	number = {4},
	year = {2001},
	pages = {333-341},
	abstract = {Chang \& Ying{\textquoteright}s (1999) computerized adaptive testing item-selection procedure stratifies the item bank according to a parameter values and requires b parameter values to be evenly distributed across all strata. Thus, a and b parameter values must be incorporated into how strata are formed. A refinement is proposed, based on Weiss{\textquoteright} (1973) stratification of items according to b values. Simulation studies using a retired item bank of a Graduate Record Examination test indicate that the new approach improved control of item exposure rates and reduced mean squared errors. },
	isbn = {0146-6216},
	author = {Chang, Hua-Hua and Qian, J. and Ying, Z.}
}
