Mercedes Schneider, who holds a Ph.D. In statistics, analyzes Patrick Wolf’s evaluation of the voucher program in Milwaukee. Wolf acknowledges that the voucher program may not have raised student achievement but claims that it increased graduation rates. This “success” was qualified by a high attrition rate. In the initial study, he said that the attrition rate was 75%, but subsequently revised it to 56%.

Dr. Schneider took a closer look at the study. In this post, she demystifies the technical jargon for non-specialists and clearly explains why the methods employed by Wolf and his associates do not offer much reassurance about the value of vouchers.