3 papers
econ.EM2026
The purpose of an estimator is what it does: Misspecification, estimands, and over-identification
Isaiah Andrews, Jiafeng Chen, Otavio Tecchio
In over-identified models, misspecification -- the norm rather than exception -- fundamentally changes what estimators estimate. Different estimators imply different estimands rath…
econ.EM2025
Dynamic LATEs with a Static Instrument
Bruno Ferman, Otávio Tecchio
In many situations, researchers are interested in identifying dynamic effects of an irreversible treatment with a time-invariant binary instrumental variable (IV). For example, in…
econ.EM2025
Instrumental Variables with Time-Varying Exposure: Dynamic Effects of Revascularization on Quality of Life
Joshua D. Angrist, Bruno Ferman, Carol Gao +3
This paper develops instrumental variables (IV) estimators for dynamic causal effects in randomized trials with imperfect compliance. These methods are applied to a randomized tria…