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    • Nonparametric Tests for Treatment Effect Heterogeneity 

      Hotz, V.J.; Crump, Richard; Imbens, Guido; Mitnik, Oscar (2008)
      A large part of the recent literature on program evaluation has focused on estimation of the average effect of the treatment under assumptions of unconfoundedness or ignorability following the seminal work by Rubin (1974) ...