1. Department of Finance, Iowa State University, Ames, IA 50011, USA
2. Department of Statistics, Iowa State University, Ames, IA 50011, USA
3. Department of Transportation, Logistics and Finance, North Dakota State University, Fargo, ND 58105, USA
4. College of Agriculture, Food and Natural Resources, University of Missouri, Columbia, MO 65211, USA
5. Certified Group, 199 W Rhapsody Dr, San Antonio, TX 78216, USA