by David Safier
A few days ago I posted briefly about a study indicating that charters have improved relative to traditional public schools. I put it up quickly, before I had a chance to look over the study, because it’s by a reputable research organization at Stanford, and because I try to represent accurately what’s going on in education, not what I think should be going on. But I also said the average increase in achievement charters showed in the study — the equivalent of 8 days extra instruction in reading and no difference in math compared to traditional public schools — is relatively small. It’s much less than the variation from school to school.
I still haven’t had a chance to read over the study myself, but others have. Here’s a word of warning: if you’re a charter school supporter in Arizona, don’t go bragging about the study. Arizona is one of 8 states where charters underperformed traditional public schools (in 11 states charters outperformed traditional public schools, and the results were mixed in the remaining states). The average Arizona charter students scored as if they had 22 fewer days of instruction in reading and 29 fewer days of instruction in math than students at Arizona’s traditional public schools. That’s a significant difference.