Institution: | 1. School of Statistics and Information, Shanghai University of International Business and Economics, Shanghai, 201620, China(fanyan212@162.com);2. C.A.S.E.—Center for Applied Statistics and Economics, Humboldt-Universit?t zu Berlin, 10178 Berlin, Germany, and Singapore Management University, Singapore 178899(haerdle@wiwi.hu-berlin.de);3. King’s College London, London, United Kingdom, and Ladislaus von Bortkiewicz Chair of Statistics, Humboldt-Universit?t zu Berlin, 10178 Berlin, Germany(wangwein@cms.hu-berlin.de);4. Department of Mathematics, Hong Kong Baptist University, Hong Kong, China, and School of Statistics, Beijing Normal Univeristy, Beijing, China(lzhu@hkbu.edu.hk) |