Department of Statistics, University of Tennessee, 334 Stokely Management Building, Knoxville, TN 37996-0532, USA.|Department of Statistics, University of Tennessee, 334 Stokely Management Building, Knoxville, TN 37996-0532, USA.|Department of Statistics, University of Tennessee, 334 Stokely Management Building, Knoxville, TN 37996-0532, USA.|Department of Statistics, University of Tennessee, 334 Stokely Management Building, Knoxville, TN 37996-0532, USA.|Department of Statistics, University of Tennessee, 334 Stokely Management Building, Knoxville, TN 37996-0532, USA.