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A More Robust t-Test

Ulrich K. Müller
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Ulrich K. Müller: Princeton University

The Review of Economics and Statistics, 2025, vol. 107, issue 3, 786-802

Abstract: This paper combines extreme value theory for the smallest and largest k observations for some given k > 1 with a normal approximation for the average of the remaining observations to construct a more robust alternative to the usual t-test. The new test is found to control size much more successfully in small samples compared to existing methods. This holds for the canonical inference for the mean problem based on an i.i.d. sample, but also when comparing two population means and when conducting inference about linear regression coefficients with clustered standard errors.

Date: 2025
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The Review of Economics and Statistics is currently edited by Pierre Azoulay, Olivier Coibion, Will Dobbie, Raymond Fisman, Benjamin R. Handel, Brian A. Jacob, Kareen Rozen, Xiaoxia Shi, Tavneet Suri and Yi Xu

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