Spectral analysis
نویسنده
چکیده
cov(Xi, Xj) := E(Xi − E(Xi))(Xj − E(Xj)), and cov(X) is the d×d symmetric positive semi-definite (psd) matrix whose (i, j)-th entry is cov(Xi, Xj). For now, we’ll define quantities and procedures with respect to cov(X), even though typically in practice, cov(X) can only be estimated (and we’ll come back to estimation issues later). One may also view X as being uniformly distributed over the data you have.
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