Hi all,
Our next virtual meeting will be at 12pm (EST) Wednesday, March 3, where
Arthur Yu (University of Chicago) presents research on "Beyond LATE:
Identification of ATEs of Always-Takers and Never-Takers."
*Abstract*:
In the presence of heterogeneous treatment effects, instrumental variable
(IV) estimation point identifies the local average treatment effect, an
average treatment effect (ATE) for compliers. This paper provides a set of
identification results that extrapolate the LATE to the ATEs of
always-takers and never-takers. We first show that the ATEs of
always-takers and never-takers can be written as the weighted average of
marginal treatment effect (MTE) functions. We then demonstrate that, under
additional parametric assumptions on these MTE functions, we can point
identify the ATEs of always-takers and never-takers. In the absence of
these parametric assumptions we can construct bounds for the ATEs of
always-takers and never-takers by linear programming developed in Mogstad
et al. (2018), which performs better than the competing partial
identification strategies. We illustrate the proposed methodology using a
simulation study and an application based on Kern and Hainmueller (2009).
We find that exposure to West German television reduces support for
communism among never-takers. These never-takers, who would not watch West
German TV even if they had improved access, act as-if they anticipate the
effect of watching West German TV and thus opt out of exposure.
*Zoom link*:
https://harvard.zoom.us/j/97787602526?pwd=Uzh3bVVVS0F4TEVYQTJlV3BQNjcydz09
*Schedule of the workshop*:
https://projects.iq.harvard.edu/applied.stats.workshop-gov3009
Looking forward to seeing you all on Wednesday!
Best,
Soichiro
--
Soichiro Yamauchi
PhD candidate
Harvard University
URL:
https://soichiroy.github.io/