WNYC:
New York City charter schools retain more of their students, on average, than traditional public schools, according to Department of Education data obtained and analyzed by WNYC.
Citywide, across all grades, 10.6 percent of charter school students transferred out in 2013-14, compared to 13 percent of traditional public school students. But there is wide variety among these schools and among the different networks. You can see all of our data here.