1. School of Economics Nanjing University of Finance and Economics Nanjing P.R. China
2. Department of Statistics University of Wisconsin‐Madison Madison Wisconsin USA
3. Department of Biostatistics Virginia Commonwealth University Richmond Virginia USA
4. KLATASDS‐MOE, School of Statistics East China Normal University Shanghai P.R. China
5. Department of Statistics and Department of Entomology University of Wisconsin‐Madison Madison Wisconsin USA