Chang, H., & Zhang, J. (2002). Hypergeometric family and item overlap rates in computerized adaptive testing. Psychometrika, 67, 387-398.
2.
Chang, H., & Zhang, J. (2003, April). Assessing CAT security breaches by the item pooling index. Paper presented at the annual meeting of the National Council on Measurement in Education, Chicago.
3.
Yi, Q., Zhang, J., & Chang, H. (2005, April). Identifying practical indices for enhancing item pool security. Paper presented at the annual meeting of the National Council on Measurement in Education, Montreal, Canada.
