Indianapolis charter schools got a vote of confidence from a recent report by Stanford’s Center for Research on Education Outcomes, better known as CREDO. The study concluded urban charter schools are outperforming neighboring public schools, and Indy charters are doing better than most.
“It confirms a lot of the results we’re seeing on the ground,” said Brandon Brown, director of charter schools for the Indianapolis mayor’s office. “If you look across the state, the performance of charter schools is mixed. But if you look specifically at Indianapolis charter schools, they tend to consistently outperform traditional public schools.”
CREDO has critics. Some say it exaggerates the difference in performance between charter schools and public schools*. Others question its methodology, which compares charter students to statistically constructed “virtual twins” in public schools. There’s also concern that CREDO’s approach distracts from what makes schools effective and contributes to the “charter wars” – a zero-sum battle for reputation and students.
But the studies carry a lot of cachet and typically get a lot of press coverage. The center and its director, Macke Raymond, have been churning out detailed reports on charter schools for years. They have a giant database of student records and use a methodology that’s complex and hard to second-guess.
In the latest study, CREDO looked at charter schools in 41 urban areas from 2006 to 2011 and concluded that, in many cities, charters are doing a better job of boosting test scores than nearby public schools serving similar students. The study says that, overall, urban charter schools are providing students with the equivalent of 40 days of additional learning in math and 28 days in reading.