1. School of Statistics and Mathematics, Guangdong University of Finance and Economics, Guangzhou 510320, China
2. Big data and Educational Statistics Application Laboratory, Guangdong University of Finance and Economics, Guangzhou 510320, China
3. School of Mathematical Sciences, Qufu Normal University, Qufu 273155, China
4. School of Mathematics and Information Science, Guangzhou University, Guangzhou 510006, China