RETRACTED: Dependence structure of the US dollar index and crude oil prices: a regime-switching copula approach

Nemer Badwan holds a PhD in economics and finance, a Doctor of Philosophy and is a candidate in economics and finance, financial sciences, finance, money circulation and credit. Nemer Badwan worked as an assistant professor in economics and finance at Don State Technical University in the Russian Federation. At the present time, Nemer Badwan is a senior lecturer, senior researcher, instructor researcher, author, academic editor and reviewer at Elsevier (Scopus) and Clarivate (Web of Science). Nemer Badwan also worked as a financial manager and financial analyst. Previously, he worked as a deputy financial and administrative director and financial auditor for financial cooperation companies, specializing in economic feasibility studies, financial planning, monetary and financial policies, data analysis and statistical analysis as well. Nemer Badwan obtained a bachelor’s degree in international economics from Kyiv National Economic University; a master’s degree in international economics from Kyiv National Economic University; and then also a PhD in economics and finance (finance, money circulation and credit) from Don State Technical University and North Ossetian State University named after Costa Ivanovic Khetagurov. Previously, he was a senior lecturer in economics and finance at the faculty of finance and credit at Don State Technical University. Nemer Badwan has many research papers and book chapters published in international economic and financial journals. His research interests and specializations include financial econometrics, financial economics, international economics and finance, mathematical economics, macroeconomics, microeconomics, monetary policy, fiscal policy, financial mathematics and capital markets, financial markets, banking, capital markets, economics, finance, financial accounting, financial auditing, financial analysis, treasury financial management, financial capital, financial development, financial management, financial policy, financial reporting, financial risk management, stock exchange, financial statement analyst and investment. Nemer Badwan is now an assistant professor of economics and finance at the Computerized of Banking and Financial Department; Faculty of Business and Economics; Palestine Technical University – Kadoorie (PTUK); Tulkarm; West Bank; State of Palestine and a senior researcher.

Suhaib Al-Khazaleh holds a PhD in Finance, specializing in corporate governance and corporate finance. He earned his bachelor’s degree in finance and banking from Al-Bayt University in Jordan, followed by a master’s degree in the same field from the same institution. Al-Khazaleh furthered his academic journey by pursuing a PhD in Corporate Finance at the prestigious University of Sian’s Malaysia (USM). With a rich educational background, he has become a prominent figure in the fields of finance and banking. Al-Khazaleh is currently working as an assistant professor at Amman Arab University, where he imparts his knowledge and expertise to students aspiring to excel in the field of finance. His research interests encompass various aspects of corporate governance and corporate finance, reflecting his dedication to understanding and improving financial systems. His expertise extends to areas such as financial management, investment analysis and risk assessment. Throughout his academic career, Al-Khazaleh has significantly contributed to the body of knowledge in finance through his research endeavors and publications. In addition to his academic pursuits, he serves as a reviewer for renowned journals indexed in Web of Science and Scopus. His role as a reviewer underscores his commitment to maintaining the quality and integrity of scholarly publications within the finance discipline. Al-Khazaleh’s expertise, coupled with his passion for advancing knowledge in finance, makes him a respected authority in academia and the financial industry.

Ihab Qubbaj holds a PhD in Business Administration and currently serves as the Dean of the College of Graduate Studies at Palestine Technical University – Kadoorie (PTUK). Additionally, he works as an advisor to the Minister of Higher Education and Scientific Research. Ihab has held various esteemed positions throughout his career, including assistant minister of Higher Education and Scientific Research for Technical Education, assistant deputy minister for Higher Education, member of the board of directors of the Higher Council for Innovation and Excellence, and member of the Palestinian Higher Education Council. Ihab’s research interests encompass several areas, including finance, entrepreneurship, innovation, emotional intelligence, leadership and quality, among others. He has actively participated in numerous scientific committees for both local and international conferences. Moreover, he has represented Palestine in various international forums, advocating for the development of higher education systems and scientific research. He is an associate professor of Business Administration at the Computerized of Banking and Financial Department; Faculty of Business and Economics; Palestine Technical University – Kadoorie (PTUK); Tulkarm; West Bank; State of Palestine and a senior researcher].

Ahmad Yahiya Bani Ahmad holds a PhD in Accounting from Jai Narain Vyas University, India. Ahmad Bani Ahmad has master’s degree in Accounting from the M.S.U. of Baroda, India. He also has a bachelor’s degree in Accounting from Aligarh Muslim University, India. He is currently working as an associate professor in Department of Accounting and Finance Science, Faculty of Business, Middle East University, Jordan. Ahmad Bani Ahmad has attended many international conferences in different countries, such as the USA and the UK. He has also published many articles in Accounting Information Systems, Costing, Risk Management, Financial Technology, Machine Learning, and Machine Learning Deep Learning.