Yesterday, NBER released the first random-assignment study of a school choice program ever to find a negative result. Students who received a voucher through the Louisiana Scholarship Program (LSP) during the 2012-13 school year were 50 percent more likely to receive a failing score on the state math test than students who applied for but did not receive a voucher. The study also found negative effects on reading, science, and social studies tests.
The previous research on school choice had been almost unanimously positive. Out of a dozen previous random-assignment studies, 11 found positive results overall or for some subgroups, and only one found no statistically significant impact. Until now, none found any harm.
So what happened this time? As I explain at Education Next today:
Although not conclusive, there is considerable evidence that problem stemmed from poor program design. Regulations intended to guarantee quality might well have had the opposite effect. The [Louisiana Scholarship Program]’s high level of private-school regulation appears to have driven away better schools while attracting primarily lower-performing schools with declining enrollments that were desperate for more funding.