Oster's delta can indicate robustness to omitted variables driving a coefficient to zero while still permitting sign changes, leading the authors to propose a modified measure of robustness to sign flips.
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The Effect of Omitted Variables on the Sign of Regression Coefficients
Oster's delta can indicate robustness to omitted variables driving a coefficient to zero while still permitting sign changes, leading the authors to propose a modified measure of robustness to sign flips.