A new study takes a look at whether charter schools hang on to their students.
The city's Independent Budget Office found that on average, students are more likely to stay at charter schools than students who attend traditional public schools in the same neighborhood.
Research has shown that students who change schools frequently do not perform as well as their peers, and that's especially true for minority students.
However, there is one group that doesn't fare as well at charters. The study found that special education students leave charter schools at a much higher rate than their general education peers. Only 20 percent stayed at their charter for three years.
Mayor Bill de Blasio weighed in on the findings.
"I'm happy to hear there's some progress," he said. "I do know for a fact there's some that are not meeting that standard, and we have to address that."
The study began in 2008 and tracked more than 10,000 students from kindergarten through third grade.