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Powerful t-tests in the presence of nonclassical measurement error
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Powerful t-tests in the presence of nonclassical measurement error

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  • Dongwoo Kim
  • Daniel Wilhelm

Abstract

This paper proposes a powerful alternative to the t-test of the null hypothesis that a coefficient in linear regression is equal to zero when a regressor is mismeasured. We assume there are two contaminated measurements of the regressor of interest. We allow the two measurement errors to be nonclassical in the sense that they may both be correlated with the true regressor, they may be correlated with each other, and we do not require any location normalizations on the measurement errors. We propose a new maximal t-statistic that is formed from the regression of the outcome onto a maximally weighted linear combination of the two measurements. Critical values of the test are easily computed via a multiplier bootstrap. In simulations, we show that this new test can be significantly more powerful than t-statistics based on OLS or IV estimates. Finally, we apply the proposed test to a study of returns to education based on twins data from the UK. With our maximal t-test, we can discover statistically significant returns to education when standard t-tests do not.

Suggested Citation

  • Dongwoo Kim & Daniel Wilhelm, 2023. "Powerful t-tests in the presence of nonclassical measurement error," CeMMAP working papers 22/23, Institute for Fiscal Studies.
    • Handle: RePEc:azt:cemmap:22/23
    DOI: 10.47004/wp.cem.2023.2223
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