1. University of Waikato Joint Institute, Zhejiang University City College, Hangzhou, People’s Republic of China
2. Waikato Management School, University of Waikato, Waikato, New Zealand
3. Department of Statistics, Government College University, Faisalabad, Pakistan
4. Department of Statistics, Faculty of Science, University of Sargodha, Sargodha, Pakistan
5. Department of Mathematics and Statistics, King Fahad University of Petroleum and Minerals, Dhahran, Saudi Arabia