Yesterday, the New York Times ran a front-page story purporting to show that “betting big” on charters has produced “chaos” and a “glut of schools competing for some of the nation’s poorest students.” (One wonders how many of those low-income families are upset that they have “too many” options.). However, the article’s central claim about charter school performance rests on a distorted reading of the data.
The piece claims that “half the charters perform only as well, or worse than, Detroit’s traditional public schools.” This is a distortion of the research from Stanford University’s Center for Research on Education Outcomes (CREDO). Although the article actually cites this research – noting that it is “considered the gold standard of measurement by charter school supporters across the country” – it only does so to show that one particular charter chain in Detroit is low performing. (For the record, the “gold standard” is actually a random-assignment study. CREDO used a matching approach, which is more like a silver standard. But I digress.) The NYT article fails to mention that the same study found that “on average, charter students in Michigan gain an additional two months of learning in reading and math over their [traditional public school] counterparts. The charter students in Detroit gain over three months per year more than their counterparts at traditional public schools.”
As shown in this table from page 44 of the CREDO report, nearly half of Detroit’s charter schools outperformed the city’s traditional district schools in reading and math scores, while only one percent of charter schools performed worse in reading and only seven percent performed worse in math.