Robustness of the encouragement design in a two-treatment randomized control trial
AbstractIn this paper we discuss how the " encouragement design "used in randomized controlled trials can be extended to a setting with two treatments and one control group. Conditions to interpret the Two-Stage Least Squares (TSLS) estimates causally are stronger than in the case with only one treatment and one control group. A rst case where a causal interpretation holds is when only those assigned to one of the two treatments can e ectively enter the corresponding program. A second case is when there are always takers. In that second case, entry rates into a given program should be the same among those assigned to the control group and those assigned to the other program; this restriction can be tested from the data. In cases where the restriction is rejected, we derive bounds to the Local Average Treatment E ect (LATE) based on weaker monotonicity conditions. We illustrate the results using data from a large randomized experiment where job seekers at risk of long term unemployment can receive a reinforced counseling scheme o ered either by the public or the private sector, or remain on a standard track.
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Date of creation: Jun 2013
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Randomized evaluation; Local Average Treatment E ffect; Bounds;
Other versions of this item:
- Behaghel, Luc & Crépon, Bruno & Gurgand, Marc, 2013. "Robustness of the Encouragement Design in a Two-Treatment Randomized Control Trial," IZA Discussion Papers 7447, Institute for the Study of Labor (IZA).
- J64 - Labor and Demographic Economics - - Mobility, Unemployment, Vacancies, and Immigrant Workers - - - Unemployment: Models, Duration, Incidence, and Job Search
- J68 - Labor and Demographic Economics - - Mobility, Unemployment, Vacancies, and Immigrant Workers - - - Public Policy
- H44 - Public Economics - - Publicly Provided Goods - - - Publicly Provided Goods: Mixed Markets
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- David S. Lee, 2009. "Training, Wages, and Sample Selection: Estimating Sharp Bounds on Treatment Effects," Review of Economic Studies, Oxford University Press, vol. 76(3), pages 1071-1102.
- Behaghel, Luc & Crépon, Bruno & Gurgand, Marc, 2012. "Private and Public Provision of Counseling to Job-Seekers: Evidence from a Large Controlled Experiment," IZA Discussion Papers 6518, Institute for the Study of Labor (IZA).
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