Understanding instrumental variables in models with essential heterogeneity
By: James J. Heckman, Sergio Urzua, Edward J. Vytlacil.
Contributors: Urzua, Sergio, 1977-; Vytlacil, Edward.; National Bureau of Economic Research.
Series: NBER working paper series -- no. 12574.; Working paper series (National Bureau of Economic Research) -- working paper no. 12574.
Publisher: National Bureau of Economic Research
Published: 2006
Place of publication: Cambridge, Mass
Language: eng
Number of pages: 95
Subjects: Instrumental variables (Statistics) -- Mathematical models
Notes: "October 2006."

Includes bibliographical references (p. 89-95).

Also available in PDF from the NBER World Wide Web site (www.nber.org).