[1] Hunan Univ, Coll Finance & Stat, Dept Financial Engn, Changsha, Peoples R China
[2] Xiamen Univ, Wang Yanan Inst Studies Econ WISE, Xiamen, Peoples R China
[3] Xiamen Univ, Sch Econ, Dept Finance, Xiamen, Peoples R China
[4] Xiamen Univ, MOE Key Lab Econometr, Xiamen, Peoples R China