Department of Statistics, 3143 TAMU, College Station, TX 77843-3143, USA. ctekwe@stat.tamu.edu|Department of Statistics, 3143 TAMU, College Station, TX 77843-3143, USA. ctekwe@stat.tamu.edu|Department of Statistics, 3143 TAMU, College Station, TX 77843-3143, USA. ctekwe@stat.tamu.edu