[1] Tsinghua Univ, Ctr Stat Sci, Beijing, Peoples R China
[2] Tsinghua Univ, Dept Ind Engn, Beijing, Peoples R China
[3] Xiamen Univ, Wang Yanan Inst Studies Econ WISE, Sch Econ, Xiamen, Fujian, Peoples R China
[4] Xiamen Univ, Dept Stat, Sch Econ, Xiamen, Fujian, Peoples R China
[5] AP Capital Management Ltd, Dept Investment & Trading, Shenzhen, Guangdong, Peoples R China