Comments (3)
Thanks for the detailed explanation. I learned something!
from esplot.
Hi,
Thanks for highlighting this, this is actually by design!
The dynamic treatment effects (or event-study coefficients are only identified up to a constant). By convention, these coefficients are often normalized to 0 in the time t = -1.
For example, that's what is done in the figures in Cullen & Perez-Truglia, 2020. Of course, the normalization is arbitrary, and e.g. Chetty, Friedman & Rockoff, 2014 normalize with respect to other years (-3 and +2).
I know that moving the reference period is a feature that has been requested in the past, and I'll flag that as a new feature to add (i.e. changing the omitted period to t=0
or t = -2
).
There is currently an undocumented option called recenter
that may be of interest to you. It is a workaround for the under-identification of the full set of dynamic effects (i.e. the coefficients need to be relative to something). What happens is the package will estimate the normalized event study with t= -1
set to 0
as usual. Then, it will estimate the mean of the outcome variable in t = -1
and shift the whole series by that amount. That is, instead of setting t=-1
to be zero, it sets it to the mean of the outcome in t=-1
. To highlight that we've mechanically set t=-1
to it's mean, confidence intervals around that point are still ommitted
.
from esplot.
Great! Glad this was helpful!
I think this is a common source of confusion, so I'll leave this issue open until I can add this information to the package docs
from esplot.
Related Issues (7)
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from esplot.