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Limit of the Smallest Eigenvalue of a Large Dimensional Sample Covariance Matrix

Limit of the Smallest Eigenvalue of a Large Dimensional Sample Covariance Matrix

In this paper, the authors show that the smallest (if $p \leq n$) or the $(p - n + 1)$-th smallest (if $p > n$) eigenvalue of a sample covariance matrix of the form $(1/n)XX'$ tends almost surely to the limit $(1 - \sqrt y)^2$ as $n \rightarrow \infty$ and …