Department of Statistics, Box 354322 University of Washington, Seattle, WA 98195, USA.|Department of Statistics, Box 354322 University of Washington, Seattle, WA 98195, USA.|Department of Statistics, Box 354322 University of Washington, Seattle, WA 98195, USA.|Department of Statistics, Box 354322 University of Washington, Seattle, WA 98195, USA.|Department of Statistics, Box 354322 University of Washington, Seattle, WA 98195, USA.