Affiliation: | 1. School of Economic Mathematics, Southwestern University of Finance and Economics, Chengdu 611130, People's Republic of China mjt@swufe.edu.cn;3. School of Economic Mathematics, Southwestern University of Finance and Economics, Chengdu 611130, People's Republic of China;4. School of Economic Mathematics, Southwestern University of Finance and Economics, Chengdu 611130, People's Republic of China;5. Guiyang Institute for Big Data and Finance, Guizhou University of Finance and Economics, Guiyang 550025, People's Republic of China;6. Current address: Department of Statistics and Actuarial Science, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.;7. Guiyang Institute for Big Data and Finance, Guizhou University of Finance and Economics, Guiyang 550025, People's Republic of China |