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• W3201699076 abstract "While causal models are robust in that they are prediction optimal under arbitrarily strong interventions, they may not be optimal when the interventions are bounded. We prove that the classical K-class estimator satisfies such optimality by establishing a connection between K-class estimators and anchor regression. This connection further motivates a novel estimator in instrumental variable settings that minimizes the mean squared prediction error subject to the constraint that the estimator lies in an asymptotically valid confidence region of the causal coefficient. We call this estimator PULSE (p-uncorrelated least squares estimator), relate it to work on invariance, show that it can be computed efficiently as a data-driven K-class estimator, even though the underlying optimization problem is non-convex, and prove consistency. We evaluate the estimators on real data and perform simulation experiments illustrating that PULSE suffers from less variability. There are several settings including weak instrument settings, where it outperforms other estimators." @default.
• W3201699076 created "2021-10-11" @default.
• W3201699076 creator A5002127148 @default.
• W3201699076 creator A5089845970 @default.
• W3201699076 date "2021-10-02" @default.
• W3201699076 modified "2023-09-27" @default.
• W3201699076 title "Distributional Robustness of K-class Estimators and the PULSE" @default.
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• W3201699076 doi "https://doi.org/10.1093/ectj/utab031" @default.
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