Functional CLT for sample covariance matrices

Abstract

Using Bernstein polynomial approximations, we prove the central limit theorem for linear spectral statistics of sample covariance matrices, indexed by a set of functions with continuous fourth order derivatives on an open interval including [(1 - √ y)2, (1 + √ y)2], the support of the Marčenko-Pastur law. We also derive the explicit expressions for asymptotic mean and covariance functions. © 2010 ISI/BS.