The Stimulus Did Not Create Jobs: The 35,496th Try
Yes, they are back again. We have another paper claiming that the stimulus did not create jobs. Timothy Conley and Bill Dupor, professors at Western Ontario University and Ohio State respectively, have a new study of state level employment that purports to show that the stimulus cost more jobs in the private sector than it created in the public sector. I'll just quickly note a few problems with the paper.
With an exercise like this, you always have to worry about the problem of cherry picking. It is very easy to run 1000 regressions in an hour. Inevitably, you find 4 or 5 of these 1000 that show you almost anything. (Our standard of significance is a result that you would not get by random chance more than 10 times in a hundred. This means that if you ran 1000 regressions of things that had nothing to do with each other, you would expect 100 of them to have statistically significant results.)
For this reason, you usually want to run your regressions a variety of different ways to show that the results do not depend on some arbitrary specification. It doesn't look like they have done this, or at least they did not show much evidence of such robustness tests in their paper.