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Testing for correlation in Gaussian databases via local decision making
AIMS Mathematics 2025, 10(4): 7721-7766
Published: 15 April 2025
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We propose a computationally efficient statistical test for detecting correlation between two Gaussian databases. The problem is formulated as a hypothesis test: under the null hypothesis, the databases are independent; under the alternative hypothesis, they are correlated but subject to an unknown row permutation. We derive bounds on both type Ⅰ and type Ⅱ error probabilities and demonstrate that the proposed test outperforms a recently introduced method across a broad range of parameter settings. The test statistic is based on a sum of dependent indicator random variables. To effectively bound the type Ⅰ error probability, we introduce a novel graph-theoretic technique for bounding the k-th moments of such statistics.

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