There are enrollment data for 3 of the 6 KIPP schools in New York. According to these data, there is no large-scale attrition of the kind we see in California.
But we don't know if these are the same students from year to year. It's possible that a number of students left and were replaced by others, masking the fact that there was an exodus from the school. Such an exodus might be the result of students moving, students being "counseled out," students choosing to leave, or students being expelled. This is complicated by the fact that drop-outs, or at least transients, are a common phenomenon in low-income schools, even good ones. So attrition numbers would not be surprising if they were associated with your average public school. But KIPP is not your average public school. Many supporters of KIPP see it as the answer to the problems that vex inner-city schools. But from what we can tell from the California enrollment data, even KIPP cannot solve the drop-out/transient problem. And from what we can tell from the NY data, KIPP may simply be better at filling the spots left by students who leave. This would be consistent with what we know about KIPP and its "creaming" and recruiting practices.
KIPP enrollments, New York State (2004-2005 span is the most recent data)
KIPP Sankofa Charter School, Buffalo (opened in 2003)
5th grade (2003-2004) - 84
6th grade (2004-2005) - 85
0% decrease in enrollment in one year
KIPP TECH VALLEY, Albany (opened in 2005, so no data available)
KIPP Success Through Teamwork, Achievement and Responsibility College Preparatory Charter School (KIPP S.T.A.R.), Manhattan (opened in 2003)
5th grade (2003-2004) - 87
6th grade (2004-2005) - 84
.03% decrease in enrollment in one year
KIPP Always Mentally Prepared Charter School, Brooklyn (opened in 2005, so no data available)
KIPP Infinity Charter School, Manhattan (opened in 2005, so no data available)
KIPP Academy, Bronx (opened in 1995)
5th grade (2002-2003) - 69
6th grade (2003-2004) - 65
7th grade (2004-2005) - 63
.08% decrease in enrollment over three years

