[1] Guangdong Univ Finance & Econ, Sch Stat & Math, Big Data & Educ Stat Applicat Lab, Guangzhou, Peoples R China
[2] Guangdong Univ Finance & Econ, Sch Stat & Math, Guangzhou, Peoples R China
[3] Shanghai Jiao Tong Univ, Dept Math, Shanghai, Peoples R China
[4] Sun Yat Sen Univ, Dept Math, Guangzhou, Peoples R China