Economics
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So you want to use Qualtrics for longitudinal survey…
(The data and survey used in this article as illustration can be found here. Feel free to download and experiment with them!) Ah, Qualtrics. The survey platform people use for online surveys on a daily basis. It should be a surprise to no one that you can also conduct offline surveys with it, but do…
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Why should you include your controls in the first stage of 2SLS?
So I was tutoring an undergraduate/master’s level applied econometrics course, and several students asked me why it is necessary to include also the exogenous control variables in both stages of 2SLS – More specifically, wouldn’t this double-count the correlation between the instrument and the controls? This turns out to be a fascinating question that I…