1. Guizhou Key Laboratory of Big Data Statistical Analysis, Guizhou University of Finance and Economics, Guiyang, China
2. Joint Laboratory of Data Science and Business Intelligence, Southwestern University of Finance and Economics, Chengdu, China
3. Department of Economics, the Chinese University of Hong Kong, Sha Tin, New Territories, Hong Kong Special Administrative Region of China
4. School of Economics, Georgia Institute of Technology, Atlanta, GA