Affiliation: | 1. USDA National Agricultural Statistics Service , Fairfax , VA , 22030-1501 , USA;2. Department of Biostatistics , University of North Carolina , Chapel Hill , NC , 27599-2400 , USA;3. Department of Mathematics , Arizona State University , Tempe , AZ , 85287-1804 , USA;4. Department of Statistics , University of Florida , Gainesville , FL , 32611 , USA;5. Department of Statistics , Ohio State University , Columbus , OH , 43210 , USA |