1. School of Statistics, Dongbei University of Finance & Economics, Dalian 116012, China
2. School of Mathematics and Computer Science, Tongling University, Tongling 244000, China
3. School of Economics, Tongling University, Tongling 244000, China
4. University Collaborative Institute Center of Marine Economy High-Quality Development of Liaoning Province, Dalian 116029, China
5. Key Research Base of Humanities and Social Sciences of the Ministry of Education, Center for Studies of Marine Economy and Sustainable Development, Liaoning Normal University, Dalian 116029, China