1. School of Statistics and Data Science, Jiangxi University of Finance and Economics, Nanchang, Jiangxi, People's Republic of China
2. Key Laboratory of Data Science in Finance and Economics, Jiangxi University of Finance and Economics, Nanchang, Jiangxi, People's Republic of China
3. School of Economics and Management, East China University of Technology, Nanchang, China
4. Department of Economics, Management School, University of Liverpool, Liverpool, UK