Much has been said about the high demand for charter schools in entrance lotteries, but little about the choices families make once their children are actually accepted. Looking at attrition rates is important because they may tell us about the choices parents make about their children’s schools. Attrition may also indicate that some students are encouraged to leave or have been expelled. And, if proficiency rates rise over time in schools with heavy attrition, those percentages may reflect the change in the student cohort, as well as or instead of academic progress.
I took a look at changes in the size of student ELA testing cohorts for the thirteen middle school charter s that have more than one year of data between 2006 and 2009.<1> Since all students in the testing cohort must take tests every year, I was able to determine whether cohorts shrink or grow over time.
As it turns out, high-performing charter middle schools in the New York City also have extremely high rates of attrition in their testing cohorts :
* Eight of the thirteen schools have enough data to allow us to examine cohort size between 5th grade, when students enter, and 8th grade, when they graduate.<2> In four of these schools, more than 25% of the students vanished from the cohort. Of these four schools, three saw cohort declines of 30%, and one lost nearly 40%. All of these charters have been nationally or locally acclaimed as great schools that are in high demand. The average attrition for this group of eight is 23%. (charts follow.)
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