When most of us consider heart health, we likely think about our cholesterol levels. But heart health is so much more than just cholesterol. Heart disease is a complex end result of multiple factors driven by things such as food intake, movement patterns, stress, and even toxin exposure.
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A previous article discusses covariance matrices that have the same set of eigenvalues. The set of eigenvalues is called the spectrum of the matrix. For symmetric matrices, the spectrum contains real numbers. For covariance matrices, which are positive semidefinite, the eigenvalues are nonnegative. It turns out that two symmetric matrices
