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      Estimating causal effects of treatments in randomized and nonrandomized studies.

      Journal of Educational Psychology
      American Psychological Association (APA)

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          Journal
          Journal of Educational Psychology
          Journal of Educational Psychology
          American Psychological Association (APA)
          0022-0663
          1974
          1974
          : 66
          : 5
          : 688-701
          Article
          10.1037/h0037350
          19071996
          bcd52df2-dd54-42f9-a599-4542b55ec061
          © 1974
          History

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