Tag Archives: Reader Comments
Why are There So Many Dummies?
Lina from Essex writes: When talking about grouped data and 2SLS (section 4.1.3) you mention that expanding a continuous instrument is equivalent to have a set of Wald estimators that consistent estimates the causal effect of interest and in the Vietnam paper you mention that using the whole set of dummies as instruments is more […]
Regression what?!
Matt from Western Kentucky U comments on Chapter 3. . . Question: You state: “Our view is that regression can be motivated as a particular sort of weighted matching estimator, and therefore the differences between regression and matching estimates are unlikely to be of major empirical importance” (Chapter 3 p. 70) I take this to […]
High Fashion at the Spring Meeting of Young Economists
as seen at the University of Groningen . . .what a good-lookin crew! what are they spelling? I wish I knew
good eye!
Hui Cao from China caught this one . . . and it’s in the “corrected printing” to boot! On 6/21/11 12:44 PM, 晖 曹 wrote: On page 75: [p(Xi=x|Di=1)(1-p(Xi=x|Di=1)] should be [p(Di=1|Xi=x)(1-P(Di=1|Xi=x)} Yes indeed!
MHE at 12000 feet
Andrea Ichino takes the RD message to new heights (specifically, to Cime Nere in Italian, as Andrea would like it; Hintere Schwarze in German – the peak straddles the Italian-Austrian border 3624m)
Twin Econometricians!
Here’s a pair of the cutest econometricians we have ever seen, helpin’ their mama (Daniela Vuri) run regressions every day
Lagged Dependent Variables with Random Effects
Henrik Lindemann would like to come back to our advice not to use fixed effects and a lagged dependent variable at the same time (see chapter 5.3/5.4 as well as your blog entry of October 6, 2009). Is it possible to use at least a random effects model in case I decide to use the […]
ex post T and C for DD
Mel asks: Question: My understanding of a difference in difference model is that the two groups should exist before a policy takes affect (e.g. two states, companies, school districts). I was studying the impact of a policy on an outcome where the two groups did not exist until the policy went into effect and everyone […]
The t and the p for just-ID will never surprise thee
My people always say that before embarking on a difficult empirical project. A free t-shirt to the first poster who translates. JA
Covariate Contradiction?