‘Metrics Monday: Friends *Do* Let Friends Do IV

An excerpt from a post over at the interestingly named Kids Prefer Cheese:

Just don’t do [IV] …

Here are the problems.
First of all, no matter what you may have read or been taught, identification is always and everywhere an ASSUMPTION. You cannot prove your IV is valid. …

I pretty much refuse to let my grad students go on the market with an IV in the job market paper. No way, no how. Even the 80 year old deadwoods in the back of the seminar room at your job talk know how to argue about the validity of your instruments. It’s one of the easiest ways to lose control of your seminar.

As we say in Minnesota: That’s different. Two things: Continue reading

‘Metrics Monday: Regressions as Ecosystems

My teaching, service, and editorial responsibilities don’t leave me much time for research, much less for blogging these days, so I thought I would write up a quick observation about econometrics.

An old friend (not an applied econometrician) writes (via Facebook, in case you wonder about the telegraphic style of the query):

Econometrics question – have a M.Sc. student doing a study on conservation agriculture (CA) and is developing instruments for CA component use. Any suggestions on appropriate instruments?

My (less-than-helpful) answer: Continue reading

Public Comments Requested on “Climate Change, Global Food Security, and the US Food System”


I, along with a number of other researchers in the areas of agriculture, climate, and food, am one of the authors of the US Department of Agriculture’s assessment report titled “Climate Change, Global Food Security, and the US Food System.”

In the September 8 issue of the Federal Register, USDA chief economist Rob Johansson requested public comments on the report. If you would like to make public comments, you can find the notice here. Comments have to be submitted before 11:59 pm on October 8, 2015.

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