Identification of casual effects in linear models: beyond Instrumental Variables
The Instrumental Variable (IV) formula has become widely used to address the issue of identification of a causal effect in linear systems with an unobserved variable that acts as direct confounder. We here propose two alternative formulations to achieve identification when the assumptions underlying the use of IV are violated. Parallel to the IV, the proposed formulas exploit the conditional independence structure of a Directed Acyclic Graph and can be obtained via a series of univariate regressions, a feature that renders the results particularly attractive and easy to implement.
|Date of creation:||02 May 2013|
|Date of revision:|
|Contact details of provider:|| Postal: |
Phone: +39 075 5855279
Fax: +39 075 5855299
Web page: http://www.econ.unipg.it/
More information through EDIRC
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Nanny Wermuth & D. R. Cox, 2008. "Distortion of effects caused by indirect confounding," Biometrika, Biometrika Trust, vol. 95(1), pages 17-33.
- Judea Pearl, 2003. "Statistics and causal inference: A review," TEST: An Official Journal of the Spanish Society of Statistics and Operations Research, Springer, vol. 12(2), pages 281-345, December.
When requesting a correction, please mention this item's handle: RePEc:pia:wpaper:117/2013. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Davide Castellani)
If references are entirely missing, you can add them using this form.