3 papers
econ.GN2025
Killed in and after Action: The Long-lasting Effects of Combat Exposure on Mortality
Helmut Farbmacher, Rebecca Groh
This study examines long-term mortality effects of combat exposure using the Vietnam War draft lottery as a quasi-experiment. We validate the lottery by analyzing combat fatalities…
econ.EM2024
Revisiting the Many Instruments Problem using Random Matrix Theory
Helmut Farbmacher, Rebecca Groh, Michael Mühlegger +1
Instrumental variables estimation with many instruments is biased. Traditional bias-adjustments are closely connected to the Silverstein equation. Based on the theory of random mat…
econ.EM2022
Detecting Grouped Local Average Treatment Effects and Selecting True Instruments
Nicolas Apfel, Helmut Farbmacher, Rebecca Groh +2
Under an endogenous binary treatment with heterogeneous effects and multiple instruments, we propose a two-step procedure for identifying complier groups with identical local avera…