The Econ grad students at HEI (where I teach part-time) have a cool blog appropriately named Rigotnomics.
A while ago I had read a nice post in the precursor (I think) of Rigotnomics (the name of that blog was less appropriate) on the interpretation of IV regressions and their use in policy-making. The post is here.
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Friday assorted links
2 hours ago