NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Estimation of Causal Effects in Experiments with Multiple Sources of Noncompliance

John Engberg, Dennis Epple, Jason Imbrogno, Holger Sieg, Ron Zimmer

NBER Working Paper No. 14842
Issued in April 2009

---- Acknowledgements -----

John Engberg is a research scientist at the RAND Corporation, Pittsburgh, PA 15213. Dennis Epple is the Thomas Lord Professor of Economics, Holger Sieg is the Friends of Allan Meltzer Professor in Economics, Jason Imbrogno is a Ph.D. student at Carnegie Mellon University, Tepper School of Business, Pittsburgh, PA 15213. Ron Zimmer is an Associate Professor at Michigan State University, College of Education, East Lansing, MI 48824. We would like to thank Stefan Holderlein, Guido Imbens, Blaise Melly, Robert Mo├┐tt, Chris Taber, Ken Wolpin, Tiemen Woutersen, and seminar participants at UT Austin, Brown University, Carnegie Mellon University, the University of Georgia, Johns Hopkins University, the University of Maryland, the University of Wisconsin-Madison, and the 5th Conference of German Economists Abroad at the University of Bonn for comments. We would also like to thank the "mid-sized urban school district" for sharing their data. Financial support for this research is provided by the Institute of Education Sciences (IESR305A070117 and R305D090016).The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.

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