Funding for this research was provided by:
The National Social Science Foundation of China (18BTJ035)
Chongqing Social Science Planning Project (2019WT58)
Chongqing Natural Science Foundation (CSTC2020JCYJ-MSXMX0006)
Research Fund of Chongqing Technology and Business University (2019ZKYY119)
2018 Chongqing Statistics Postgraduate Tutor Team (YDS183002)
Article History
Received: 28 September 2020
Revised: 17 April 2021
Accepted: 8 August 2021
First Online: 26 August 2021