spent in one of Boston's selective exam schools, with math scores, for instance, showing positive effects of 0.18 and 0.22 standard deviations for charter middle and high schools respectively compared to an effect of 0.20 and 0.16 standard deviations for exam schools. For pilot schools, the report found that in the middle school grades pilot school students modestly underperform relative to similar students attending traditional BPS schools (-0.05 standard deviations in ELA and -0.07 in math) while showing slightly positive results in the high school grades for pilot schools (0.15 standard deviations for writing and 0.06 for math). The results using a sub-sample of schools with random lottery results found very large positive effects in both math and ELA scores for charter schools, including 0.16 and 0.19 standard deviations in middle and high school ELA scores respectively and 0.36 and 0.17 standard deviations in middle and high school math scores respectively. Boston's pilot schools, however, showed a concerning negative effect in middle school math and ELA and a slightly positive effect in high school. Los Angeles CREDO evaluated the impact of charter schools in Los Angeles from 2008 to 2012. The study found that over 48% of Los Angeles charters outperform local public schools in reading and 44% percent of Los Angeles charters outperform local public schools in math. The study concludes they believe not every charter will outperform traditional public schools, but that conditions are well suited for growth. An evaluation of Los Angeles charter schools from 2002 to 2008, published in the American Journal of Education, contends that a rapidly diversifying group of schools in the period did not improve charter school student's performance relative to their public school peers. New Orleans A 2010 case study by the Harvard Business School examined the charter school reform efforts in New Orleans. Following Hurricane Katrina, the district became composed of 70 Recovery School District (RSD) schools managed by the state (including 37 RSD charter schools) and 16 schools managed by the local Orleans Parish School Board (OPSB) (including 12 OPSB charter schools). Charter schools now account for more than 60% of the public schools in New Orleans. RSD Schools were a result of Act 9 of the Louisiana State Legislature passed in 2003 to manage under-performing schools throughout the state. When evaluating New Orleans' schools against the 200-point index called the State Performance Index (SPI),19 of the 20 highest-performing non-selective