Evaluating public programs with close substitute :
Kline, Patrick
Evaluating public programs with close substitute : The Case of head start / Patrick Kline and Christopher Walters - Cambridge NBER 2015 - 80p - NBER Working Paper ; 21658 .
NBERWP 21658
E15831.pdf
Evaluating public programs with close substitute : The Case of head start / Patrick Kline and Christopher Walters - Cambridge NBER 2015 - 80p - NBER Working Paper ; 21658 .
NBERWP 21658
E15831.pdf