NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Why ask Why? Forward Causal Inference and Reverse Causal Questions

Andrew Gelman, Guido Imbens

NBER Working Paper No. 19614
Issued in November 2013

---- Acknowledgements -----

We thank Judea Pearl and several other blog commenters for helpful input and the National Science Foundation for partial support of this work. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.

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