Method

Treated

Controls

ATT

S.E.

T-stat

Un-matched

0.6247

0.6569

−0.0321

0.0081

−3.95***

the nearest neighbor matching

0.6256

0.6465

−0.0209

0.0102

−2.05**

radius matching

0.6256

0.6432

−0.0176

0.0087

−2.02**

kernel matching

0.6256

0.6431

−0.0175

0.0087

−2.01**