1. Department of Management Engineering, Zhengzhou University of Aeronautics, Zhengzhou, China
2. School of Statistics and Mathematics, Zhejiang Gongshang University, Hangzhou, China
3. Collaborative Innovation Center of Statistical Data Engineering, Technology & Application, Zhejiang Gongshang University, Hangzhou, China
4. College of Management and Economics, Tianjin University, Tianjin, China
5. Department of Statistics, Virginia Tech, Blacksburg, VA, USA