About the Authors
- Yang Xu
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Roles Formal analysis, Methodology, Software, Writing – original draft
* E-mail: junnie5@163.com
Affiliations Zhongtai Securities Institute for Financial Studies, Shandong University, Jinan, Shandong, China, Department of Statistics, Northwestern University, Evanston, Illinois, United States of America
- Hongmei Jiang
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Roles Formal analysis, Methodology, Supervision, Writing – review & editing
Affiliation Department of Statistics, Northwestern University, Evanston, Illinois, United States of America
- Wenxin Jiang
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Roles Formal analysis, Methodology, Supervision, Writing – review & editing
Affiliation Department of Statistics, Northwestern University, Evanston, Illinois, United States of America
Competing Interests
The authors have declared that no competing interests exist.