TY  - JOUR
TI  - Efficient Estimation of Average Treatment Effects Using the Estimated Propensity Score
AU  - Keisuke Hirano
AU  - Guido W. Imbens
AU  - Geert Ridder
JO  - Econometrica
PY  - 2003
VL  - 71
IS  - 4
DO  - 10.1111/1468-0262.00442
UR  - https://doi.org/10.1111/1468-0262.00442
ER  -