Charter schools have evolved over the course of two decades, and their students now show greater academic gains than their peers in traditional public schools, according to a new report from a group of researchers who have studied the evolution of charters since 2000.
The study, which examined student performance in 6,200 charter schools from 2014 to 2019, marks a turning point in the understanding of charter school performance. It鈥檚 the third study of its kind from researchers at the Center for Research on Education Outcomes, or CREDO, after the center鈥檚 earlier studies found that charter school students performed either worse than or about the same as their peers in traditional public schools.
From 2014 to 2019, charter school students gained, on average, the equivalent of 16 days of learning in reading and six days in math over their peers in traditional public schools. Eighty-three percent of charter school students performed the same as or better than their peers in reading, and 75 percent performed the same as or better in math, according to the study, which includes data from 29 states, New York City, and the District of Columbia.
The average charter school performance in reading and math has only grown since 2000-01, showing a long-term pattern of charter schools outperforming the national trend, which showed student performance plateauing during that same time period, as measured by the National Assessment of Educational Progress, or NAEP.
The researchers used standardized testing data from state education agencies and schools to match 1,853,000 charter students with peers in the traditional public schools they otherwise would have attended to compare charter and traditional students.
鈥淭hat is really pretty remarkable in the sense that if you picture in your mind the NAEP line over the same 15-year period, that鈥檚 flat. We didn鈥檛 get a lot of traction as a nation,鈥� said Margaret 鈥淢acke鈥� Raymond, founder and director of CREDO, which operates out of Stanford University. 鈥淚f you look at the traction [charter] schools have had over the same period, for me, it鈥檚 not specifically, 鈥榶ay, rah, charter schools.鈥� It鈥檚, hey guys, there鈥檚 a way to build that improvement line.鈥�
Study shows a long-term trend
CREDO has studied the performance of charter schools as the publicly funded but independently run schools have proliferated and become a mainstay in the nation鈥檚 educational landscape.
The first charter school opened in Minnesota in 1992. Some 3.7 million students attended 7,800 charter schools in the fall of 2021, . Their enrollment more than doubled between 2010 and 2021, and the number of schools grew by nearly 50 percent in that time. Eight percent of public schools were charters in the fall of 2021, up from 5 percent a decade earlier. The schools also grew more racially diverse in that time.
While traditional public school enrollment declined by 4 percent in the first year of the pandemic, between fall 2019 and fall 2020, charter school enrollment grew 7 percent.
CREDO鈥檚 first study, conducted from 2000-01 through 2007-08, showed that charter school students lost six days of learning in reading and 17 days of learning in math measured against the average 180 days of learning a traditional public school student would receive.
Raymond described the results of that first study, released in 2009 as the administration of then-President Barack Obama began a major push to expand charters, as a 鈥渃old shower鈥� for charter school leaders and advocates.
The next study, analyzing school performance from 2006-07 through 2010-11, showed slight improvement. Charter students gained an additional six days of learning in reading, outpacing traditional public school students, and lost three days of learning in math, effectively breaking even with traditional public school students鈥� average of 180 days of learning.
But Raymond and her team were hesitant to interpret those results as a trend.
The 2023 study, however, confirmed a positive trend for student performance in charter schools.
鈥淲e needed the third study in order to be able to say, 鈥楲ook, this isn鈥檛 an accident, this isn鈥檛 a fluke,鈥欌�� Raymond said. 鈥淭his is actually a persistent condition of the context about charter schooling.鈥�
The study tells a story of how the charter school sector improved after the 2009 study.
Early on in the creation of charter schools, charter school authorizers鈥攖he entities that allow charter schools to open and oversee them once they鈥檙e running鈥攁nd charter management organizations that operate schools were focused on opening as many schools as possible, Raymond said.
Following the 2009 report, many charter school authorizers鈥攚hich include school districts and state boards鈥攆ound themselves looking more critically at the model and focusing on improving schools that already existed rather than creating new ones.
Organizations like the National Association of Charter School Authorizers helped charter school authorizers become more rigorous and increase their focus on accountability, Raymond said.
鈥淲hat happens from 2010 to present day, is that the authorizer side of the equation gets really serious,鈥� Raymond said.
Charter school authorizers should be 鈥済overnors of quality,鈥� the study says, pushing charter schools to innovate and improve outcomes for students.
The states and cities that really committed to improving school outcomes are reflected in the data of the latest study. Raymond pointed to New York, where charter school students gained 75 days of reading and 73 days of math from 2014 to 2019 over traditional public school students. Rhode Island and Tennessee also saw significant gains, with students in Rhode Island gaining 90 days of reading and 88 days of math and Tennessee students gaining 33.5 days of reading and 39 days of math.
Charter school authorizers 鈥済ot very serious about doing a good job of reviewing applications at the beginning, and being really tough about who gets in the game. But even more so, they鈥檙e very serious about review and action at the point of renewal,鈥� Raymond said.
Not every charter school is succeeding
While the study provides an overwhelmingly positive outlook on charter schools, the sector鈥檚 performance isn鈥檛 universally positive.
Full-time online charter schools in particular failed students in both reading and math, according to the study. Students in online charter schools lost 58 days of reading and 124 days of math learning compared to traditional public school student learning days while students in brick-and-mortar charter schools gained an average of 22 days of reading and 15 days of math.
鈥淭he learning there is just completely dreadful,鈥� Raymond said. 鈥淭he kids in online schools on average lose a third of the year in reading and two-thirds of a year of growth in math. That鈥檚 horrific.鈥�
Charter schools are also failing to serve special education students, a group that has historically been underserved by the public school system as a whole. Those students lost 13 days in reading and 14 days in math.
Traditionally, a lower percentage of charter school students have required special education than traditional public school students, and charter schools have been accused of enrolling only students with less severe disabilities.
Nearly 11 percent of charter school students qualified for special education in 2016, compared with nearly 13 percent in traditional public schools, according to by The Center for Learner Equity. A previous analysis by the nonprofit, which focuses on equitable education access for students with disabilities, found that charter schools enrolled fewer students with developmental delays, multiple disabilities, and intellectual disabilities than traditional public schools.
Meanwhile, other students in special populations attending charter schools have seen growth, according to CREDO鈥檚 analysis. Students in poverty gained 23 days of reading and 17 days of math while English learners gained six days of reading and eight days of math compared with their peers in traditional public schools.
鈥淭here鈥檚 a slice of kids in the charter schools in special education that are not being served as well as they would have been had they gone to district schools,鈥� Raymond said. 鈥淭his is a consistent and persistent finding, and it鈥檚 something that the community of charter schools has to address.鈥�
Lessons for traditional public schools
Raymond doesn鈥檛 see the study as a full endorsement of charter schools, but rather an indication that the flexibility afforded to charters鈥攁nd flexibility they afford their staffs鈥攃an lead to better outcomes for students.
鈥淭he largest source of the improvement is that existing schools improve over time, not that we get much better schools coming into the mix,鈥� she said. 鈥淚n order to do that, school teams have to have this capacity to adapt... It鈥檚 not that you鈥檙e doing revolution, it鈥檚 that you鈥檙e doing evolution. You鈥檙e trying little things here and there.鈥�
That lesson may be especially important following the COVID-19 pandemic. The study was conducted before the pandemic took place, but indicates that schools with the capacity to try new things and adapt to changing circumstances can produce positive student outcomes, Raymond said.
鈥淭he bigger lesson now in the post-COVID world is, hey guys, if you鈥檙e looking for a way to improve outcomes for kids, here is an absolutely demonstrated framework that you can look at and maybe apply it in other contexts,鈥� Raymond said.
