Bibliographical noteFunding Information:
Yuhong Yang is Professor (E-mail: firstname.lastname@example.org) and Gang Cheng is Ph.D. Student, School of Statistics, University of Minnesota, 313 Ford Hall, 224 Church St. SE, Minneapolis, MN 55455. We greatly appreciate this opportunity to discuss the novel work of Laber and Murphy. We have learned much from the article and the process of preparing this discussion. We also thank the authors for sharing their codes with us, as well as many helpful communications. The research of Yuhong Yang is supported in part by National Science Foundation Grant DMS-0706850.
Susan Wei is PhD Student (E-mail: email@example.com) and Andrew B. Nobel is Professor (E-mail: firstname.lastname@example.org), Department of Statistics and Operations Research, University of North Carolina, Chapel Hill, NC 27599-3260. The authors would like to acknowledge extensive and helpful discussions with Andrey Shabalin, who also provided assistance with some of the simulations. In addition, the authors would like to thank Eric Laber for helpful discussions and feedback. This work was supported in part by National Science Foundation Grant DMS-0907177, a National Science Foundation Graduate Fellowship, and National Institutes of Health Grant T32 GM067553-05S1.