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SUPERCONSISTENCY OF TESTS IN HIGH DIMENSIONS
Published online by Cambridge University Press: 28 October 2022
Abstract
To assess whether there is some signal in a big database, aggregate tests for the global null hypothesis of no effect are routinely applied in practice before more specialized analysis is carried out. Although a plethora of aggregate tests is available, each test has its strengths but also its blind spots. In a Gaussian sequence model, we study whether it is possible to obtain a test with substantially better consistency properties than the likelihood ratio (LR; i.e., Euclidean norm-based) test. We establish an impossibility result, showing that in the high-dimensional framework we consider, the set of alternatives for which a test may improve upon the LR test (i.e., its superconsistency points) is always asymptotically negligible in a relative volume sense.
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- © The Author(s), 2022. Published by Cambridge University Press
Footnotes
We are grateful for the comments of the Editor, a Co-Editor, four referees, and the participants of the “High Voltage Econometrics” workshop, which helped to improve the previous version of the manuscript.