The team, led by Corey A. DeAngelis of the Cato Institute, a free market-oriented think tank, and Patrick J. Wolf of the university’s Department of Education Reform, also analyzed documents and provided equity grades for schools in Boston; Indianapolis; Little Rock, Arkansas; Memphis, Tennessee; Oakland, California; San Antonio, Texas; and Tulsa, Oklahoma. New Orleans, which mostly has charter schools and has received federal funding to help schools recover from Hurricane Katrina, is a unique case and was excluded from the overall analysis. But the researchers still found some large disparities in funding between traditional and charter schools there.