Authors: Smith, JA Todd, PE

Citation: Ja. Smith et Pe. Todd, Reconciling conflicting evidence on the performance of propensity-score matching methods, AM ECON REV, 91(2), 2001, pp. 112-118

Authors: Heckman, JJ Lyons, TM Todd, PE

Citation: Jj. Heckman et al., Understanding black-white wage differentials, 1960-1990, AM ECON REV, 90(2), 2000, pp. 344-349