基金the National Natural Science Foundation of China(10431010)the MOE Project of Key Research Institute of Humanities and Social Sciences in Universities (05JJD910001)Center for Applied Statistics of Renmin University of China
基金supported by the High-Level Personnel Fund of Xiamen University of Technology(Grant No.YKJ15031R)the Graduate Innovation Fund of Shanghai University of Finance and Economics(Grant No.CXJJ-2013-459)