National Charter School Study 2013

In the aggregate, charter school students in the 26 states in the new study gained an additional 8 days of learning each year in reading beyond their local peers in traditional public schools. The 2009 study found a loss of 7 days each year in reading among the students in the 16 states. In mathematics, charter school students in 2009 posted 22 fewer days of learning than their traditional public school counterparts; today there exists no significant difference in days of learning.