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A simple test for the ignorability of non-compliance in experiments

abstract This papers proposes a simple method for testing whether non-compliance in experiments is ignorable, i.e., not jointly related to the treatment and the outcome. The approach consists of (i) regressing the outcome variable on a constant, the treatment, the assignment indicator, and the treatment/assignment interaction and (ii) testing whether the coefficients on the latter two variables are jointly equal to zero. A brief simulation study illustrates the finite sample properties of the test.
   
type journal paper
   
keywords experiment, treatment effects, non-compliance, endogeneity, test.
   
language English
kind of paper journal article
date of appearance 9-2013
journal Economics Letters
publisher Elsevier (Amsterdam)
ISSN 0165-1765
ISSN (online) 1873-7374
DOI 10.1016/j.econlet.2013.05.018
volume of journal 120
number of issue 3
page(s) 389-391
review double-blind review
   
profile area SEPS - Quantitative Economic Methods
citation Huber, M. (2013). A simple test for the ignorability of non-compliance in experiments. Economics Letters, 120(3), 389-391, DOI:10.1016/j.econlet.2013.05.018.