1. School of Statistics, Chengdu University of Information Technology, No. 10, Happiness Road, Longquanyi District, Chengdu 610603, Sichuan, China
2. Key Laboratory of Statistical Information Technology and Data Mining, State Statistics Bureau, No. 10, Happiness Road, Longquanyi District, Chengdu 610603, Sichuan, China
3. School of Economics, Southwest Minzu University, No. 168, Wenxing Section, Dazhong Road, Shuangliu, Chengdu 610041, Sichuan, China
4. School of Business, Chengdu University, No. 2025, Chengluo Avenue, Chengdu 610106, Sichuan, China