journal article
Four Parameters of Interest in the Evaluation of Social Programs
James Heckman, Justin L. Tobias and Edward Vytlacil
Southern Economic Journal
Vol. 68, No. 2 (Oct., 2001), pp. 210-223 (14 pages)
Published By: Southern Economic Association
DOI: 10.2307/1061591
https://www.jstor.org/stable/1061591
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