Xiao-Hua Zhou, PhD, is Professor in the Departmentof Biostatistics at the University of Washington and Director andResearch Career Scientist at the Biostatistics Unit of the VeteransAffairs Puget Sound Health Care System. Dr. Zhou is AssociateEditor of Statistics in Medicine and has published over 200journal articles in his areas of research interest, which includestatistical methods in diagnostic medicine, analysis of skeweddata, causal inferences, and statistical methods for assessingpredictive values of biomarkers. Chuan Zhou, PhD, is Research Associate Professorof Biostatistics in the Department of Pediatrics at University ofWashington. He has coauthored numerous journal articles in hisresearch areas of interest, which include clinical trials, healthservice research, diagnostics, missing data, and causalinference. Danping Liu, PhD, is Investigator in the Divisionof Intramural Population Health Research at the Eunice KennedyShriver National Institute of Child Health and HumanDevelopment. He has authored numerous research articles in hisresearch areas of interest, which include medical diagnostictesting and ROC curve, missing data methodologies, longitudinaldata analysis, and non- and-semi-parametric inferences. Xiaobo Ding, PhD, is AssistantProfessor in the Academy of Mathematics and Systems Science at theChinese Academy of Sciences. His research interests includedimension reduction, variable selection, missing data, confidencebands, and goodness of fit tests.