1. Swati Biswas is Assistant Professor, Department of Biostatistics, University of North Texas Health Science Center, Fort Worth, TX 76107 . Shili Lin is Professor, Department of Statistics, The Ohio State University, Columbus, OH 43210 . This work was supported in part by National Science Foundation grants DMS-99-71770 and DMS-03-66800 and National Institutes of Health grant 5R01HG002657-03. The authors sincerely thank Chris Amos for providing the lung cancer dataset of Genetic Epidemiology of Lung Cancer...