Department of Statistics, U-4120, University of Connecticut, Storrs, CT 06269-4120, USA. fur@ohsu.edu|Department of Statistics, U-4120, University of Connecticut, Storrs, CT 06269-4120, USA. fur@ohsu.edu|Department of Statistics, U-4120, University of Connecticut, Storrs, CT 06269-4120, USA. fur@ohsu.edu