Affiliation: | A1 Department of Mathematics and Statistics, Wright State University, Dayton, OH 45435, USA E-mail: wwang@math.wright.edu A2 Department of Statistical Science, Cornell University, Ithaca, NY 14853, USA E-mail: hwang@math.cornell.edu A3 Department of Statistics, Purdue University, West Lafayette, Indiana 47907, USA E-mail: dasgupta@stat.purdue.edu |