If You Win a Charter School Lottery, You’re Happy. But What About the Losers?

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How do we know if charter schools really do a better job of educating students? After all, maybe it’s just that better students apply to charters in the first place. The usual way of controlling for this is to examine charter schools that select students by lottery. It’s entirely random who gets in and who doesn’t, so if the charter kids do better then it probably really is due to the school itself.

Last year, however, I tossed out a reason for skepticism:

Ever since seeing Waiting for Superman, I’ve had a nagging question about this. That documentary, if it’s accurate, made it clear that parents who apply to charter schools are almost desperately anxious for their kids to get in. In fact, many of them view it as practically their only chance to escape their local schools and get their kids a real education. The ones who lose the lottery are profoundly deflated.

So here’s my question: is it possible that the mere act of losing out in a charter school lottery changes some parents’ behavior? With their hopes dashed, do they give up? Do they gradually stop taking an interest in their child’s education? Do they become fatalistic about the prospect of success and stop prodding their kids to do their homework, behave in class, and get to school on time? And if some substantial fraction of them do, how much overall impact does this have on the aggregate test scores of the lottery-losing children?

Last night, Adam Ozimek blogged about a new NBER study that takes a crack at answering this question. All the usual caveats apply: It’s only one study. A variety of techniques were used to select only about 4,000 students out of the original sample of 16,000. The study covers only a single semester, which might not be enough time to see a substantial “loser effect.” And the specific variable that they studied is fairly limited.

That said, the study is interesting! The authors took a look at truancy rates as a proxy for motivation levels before and after the lottery results were announced. This is pretty clever. And since lottery results were announced in the middle of the school year, they were able to look at truancy rates after the lottery results were announced but before the winners entered the charter school. For a single semester, both the winners and losers were still attending their old schools. The only difference was that some knew they had won the lottery and would be moving on, while others knew they had lost the lottery and would be staying at their old school.

The chart on the right shows the basic results. Among girls, the effect was small and there was very little difference between lottery winners and losers. Among boys, however, lottery winners showed a big drop in truancy compared to the broad student body, while lottery losers showed essentially no change at all. So the mere act of winning the lottery apparently had a big positive impact on winners, but didn’t have a big negative impact on losers. Here’s what the researchers conclude about this:

We interpret this as students exerting more effort towards academics at their current school due to an increase in intrinsic motivation from knowing that they will be able to attend a school of their choice in the subsequent school year. To our knowledge, this is the first paper to separately identify this important channel through which NCLB school choice provisions may positively affect academic achievement among low-income and minority students.

Adam points out that these results are a double-edged sword for charter proponents. On the one hand, they show that better student performance at charter schools might not be entirely due to the schools themselves. Some of it may be due to the simple excitment of being accepted at the school in the first place. On the other hand, who cares? “It just highlights a previously underappreciated mechanism through which choice increases performance. As the authors of the study point out, this is consistent with the growing literature from Heckman and others showing that non-cognitive skills affect outcomes. It should not be surprising that the students who most wish to leave a school and attend another will be motivated by their ability to do so.”

I’ll repeat that all the caveats above apply. Truancy is an interesting proxy, but it hardly tells the whole story of student/parent motivation. And if there is a negative effect on motivation from losing a lottery, it might well take more than a few months for it to show up.

However, to the extent that this study tells us something, what it tells us is that losing a lottery doesn’t seem to make kids any worse off or any less motivated. The effect is purely a positive one for the winners.


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