Bibliographical noteFunding Information:
Lan Wang (E-mail: email@example.com) is Associate Professor and Ben Sherwood (E-mail: firstname.lastname@example.org) is graduate student, School of Statistics, University of Minnesota, Minneapolis, MN 55455. Runze Li is Distinguished Professor, Department of Statistics and the Methodology Center, the Pennsylvania State University, University Park, PA 16802-2111 (E-mail: email@example.com). Wang and Sherwood’s research is supported by an NSF grant DMS1308960. Li’s research is supported by NIDA, NIH grants P50 DA10075 and P50 DA036107. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIDA or the NIH.