Tag Archives: Questions
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 […]
Principals of principal stratification
Mike Sconces asks: Question: I have questions about "bad control" (BC) (Section 3.2.3, p. 64). Your prescription is to leave the BC out of the model, or else to have strong theory for leaving it in. In the stats literature, there is discussion of "principal stratification" (PS). Let w_0i, w_1i be the potential outcome of […]
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
Regression Is Matching (one more way; with discussion!)
Pat Kline has a nifty new interpretation of the old Blinder-Oaxaca regression estimator for two-group comparisons (in this case, applied to treatment effects in a selection-on-observables setup) . . . It’s a matching estimator, of course! Here’s the version we saw at ASSA in Denver, niftier than ever! and my discussion, which is pretty good […]
Kindle KAOS
A few disappointed readers have commented that the kindle version of MHE suuu . . . is not so hot. Math font KAOS, Mr. Smart! (with type set by Shtarker, among other unforgivable glitches.) But ebook aficianados don’t dispair, just install one of Amazon’s free reading apps and read glitch-free on the hardware of your […]
Corrections Coming!
Princeton University Press has graciously released a corrected version of MHE. This is not a new edition (we’re still recovering from the first!). But we’ve corrected the mistakes uncovered by careful readers in the past 18 months. The corrected version is now in print and should be shipping soon from Amazon and other big retailers. […]
The RD bandwidth thing
Vanderson Amadeu da Rocha, a student of economics at FEA-RP / USP, Brazil, asks: My questions are about the chapter of Regression Discontinuity Designs. What criteria are used to determine the neighborhood size in nonparametric RDD Fuzzy and Sharp? Great question Vanderson – The bandwidth is indeed at the business end of nonparametric RD, though […]
High Fashion at the Spring Meeting of Young Economists