Charter School Efficacy

From http://credo.stanford.edu/reports/MULTIPLE_CHOICE_CREDO.pdf (p. 4)

• The academic success of charter school students was found to be affected by the
contours of the charter policies under which their schools operate.
• States that have limits on the number of charter schools permitted to operate, known as
caps, realize significantly lower academic growth than states without caps, around .03
standard deviations.
• States that empower multiple entities to act as charter school authorizers realize
significantly lower growth in academic learning in their students, on the order of ‐.08
standard deviations. While more research is needed into the causal mechanism, it
appears that charter school operators are able to identify and choose the more
permissive entity to provide them oversight.
• Where state charter legislation provides an avenue for appeals of adverse decisions on
applications or renewals, students realize a small but significant gain in learning, about
.02 standard deviations.