Treatment Interaction with Non-Experimental Data in Stata

Graham Brown, Thanos Mergoupis

Research output: Working paper

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Abstract

Treatment effects may vary with the observed characteristics of the treated, often with important implications. In the context of experimental data, a growing literature deals with the problem of specifying treatment interaction terms that most effectively capture this variation. Some of the results of this literature are now implemented in Stata. With non-experimental (observational) data, and in particular when selection into treatment depends on unmeasured factors, treatment effects can be estimated using Stata's treatreg command. Although not originally designed for this purpose, treatreg can be used to consistently estimate treatment interactions parameters. In the presence of interactions, however, adjustments are required to generate predicted values and estimate the Average Treatment Effect (ATE). This paper introduces commands that perform this adjustment for the case of multiplicative interactions and shows the adjustment that is required for more complicated interactions.
Original languageEnglish
Place of PublicationBath, U. K.
PublisherDepartment of Economics, University of Bath
Publication statusPublished - 2010

Publication series

NameBath Economics Research Working Papers
No.10/10

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    Brown, G., & Mergoupis, T. (2010). Treatment Interaction with Non-Experimental Data in Stata. (Bath Economics Research Working Papers; No. 10/10). Department of Economics, University of Bath.