Hadamard product of independent random sample covariance matrices with correlation structure

preprint2026arXivOpen access

Abstract

We compute the asymptotic empirical eigenvalue distribution of the matrix M=⨀i=1k1diX(i)X(i)⊤M = \bigodot_{i=1}^k \frac{1}{d_i}X^{(i)}{X^{(i)}}^\top where X(i)∈Rn×diX^{(i)}\in\mathbb{R}^{n\times d_i} are independent matrices with independent rows but general correlation within each row under the dimension scaling nd1…dk→γ\frac{n}{d_1\dots d_k}\to γ.

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