1. School of Statistics and Data Science, Nanjing Audit University, Nanjing, China
2. Key Laboratory of Financial Engineering, Nanjing Audit University, Nanjing, China
3. School of Mathematics, China University of Mining and Technology, Xuzhou, China
4. School of Finance, Nanjing Audit University, Nanjing, China
5. School of Mathematics and Statistics, Ningbo University, Ningbo, China