Yiyun Zhang is Senior Biostatistician, Novartis Oncology, Florham Park, NJ 07932 . Runze Li is the correspondence author and Professor, Department of Statistics and The Methodology Center, The Pennsylvania State University, University Park, PA 16802-2111 . Chih-Ling Tsai is Robert W. Glock Chair professor, Graduate School of Management, University of California, Davis, CA 95616-8609 . We are grateful to the editor, the associate editor, and three referees for their helpful and constructive comments that...(2010-03-01時点)