[1] Shanghai Lixin Univ Accounting & Finance, Sch Stat & Math, Shanghai, Peoples R China
[2] Guangxi Normal Univ, Sch Math & Stat, Guilin, Peoples R China
[3] Renmin Univ China, Ctr Appl Stat, Sch Stat, Beijing 100872, Peoples R China
[4] Lanzhou Univ Finance & Econ, Sch Stat, Lanzhou 730101, Gansu, Peoples R China
[5] Xinjiang Univ Finance & Econ, Sch Stat & Informat, Urumqi 830012, Peoples R China
[6] Hang Seng Management Coll, Dept Math & Stat, Hong Kong, Peoples R China