基金supported by the Natural Science Foundation of Anhui Province(1508085QA03)the Distinguished Young Scholars Foundation of Anhui Province(1608085J06)the National Natural Science Foundation of China(11501009,11371029)
基金supported by the National Natural Science Foundation of China(11201005,11071015)the Natural Science Foundation of Anhui Province(1308085QA13)the Key Project from the National Bureau ofStatistics(2013LZ17)
基金supported by the National Natural Science Foundation of China(Grant No.11201005)the Key Project from Anhui Provincial Education Department(Grant No.gxfxZD2016015)