Looks like that study wasn't peer-reviewed, and compared voucher students with those of the general population. A later study compared voucher students with those who applied for vouchers but didn't win the vouchers, and the bad effects largely disappeared:
https://www.chalkbeat.org/2017/6/26/21107301/students-given-...
With school choice, bad schools are finally allowed to die and be replaced with good schools.
Looks like that study wasn't peer-reviewed, and compared voucher students with those of the general population. A later study compared voucher students with those who applied for vouchers but didn't win the vouchers, and the bad effects largely disappeared: https://www.chalkbeat.org/2017/6/26/21107301/students-given-...
With school choice, bad schools are finally allowed to die and be replaced with good schools.