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st: RDD robustness check: Controlling for covariates?


From   Jen Zhen <jenzhen99@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: RDD robustness check: Controlling for covariates?
Date   Mon, 13 Feb 2012 17:23:46 +0100

Dear list members,

just as a robustness check (not for the main estimates) for a
regression discontinuity design, I'd like to test whether results
change when I control for a covariate.

However, I'm unsure whether I should just control for the covariate in
the same way on both sides of the threshold, or whether I need to
allow the effect of the covariate to vary between the two sides, i.e.
should I use

- reg outcome T forcingvar T_forcingvar covar -
or
- - reg outcome T forcingvar T_forcingvar covar T_covar-  ?

Thanks so much and best regards,
JZ
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