“…The Plains States model is used in Kansas, Nebraska, North Dakota, and South Dakota (Hahn and Hansen 1991). The Central States model is used in Illinois, Indiana, Iowa, and Missouri (Hahn and Hansen 1991). The Northeast States model is used in Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, and West Virginia (Scott 1981).…”