February 2024 Logarithmic law of large random correlation matrices
Nestor Parolya, Johannes Heiny, Dorota Kurowicka
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Bernoulli 30(1): 346-370 (February 2024). DOI: 10.3150/23-BEJ1600
Abstract

Consider a random vector y=Σ12x, where the p elements of the vector x are i.i.d. real-valued random variables with zero mean and finite fourth moment, and Σ12 is a deterministic p×p matrix such that the eigenvalues of the population correlation matrix R of y are uniformly bounded away from zero and infinity. In this paper, we find that the log determinant of the sample correlation matrix Rˆ based on a sample of size n from the distribution of y satisfies a CLT (central limit theorem) for pnγ(0,1] and pn. Explicit formulas for the asymptotic mean and variance are provided. In case the mean of y is unknown, we show that after re-centering by the empirical mean the obtained CLT holds with a shift in the asymptotic mean. This result is of independent interest in both large dimensional random matrix theory and high-dimensional statistical literature of large sample correlation matrices for non-normal data. Finally, the obtained findings are applied for testing of uncorrelatedness of p random variables. Surprisingly, in the null case R=I, the test statistic becomes distribution-free and the extensive simulations show that the obtained CLT also holds if the moments of order four do not exist at all, which conjectures a promising and robust test statistic for heavy-tailed high-dimensional data.

Nestor Parolya, Johannes Heiny, and Dorota Kurowicka "Logarithmic law of large random correlation matrices," Bernoulli 30(1), 346-370, (February 2024). https://doi.org/10.3150/23-BEJ1600
Received: 1 August 2022; Published: February 2024
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Vol.30 • No. 1 • February 2024
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