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Consider the (4 X 4) covariance (correlation) matrix of Example 3.2. Verify the results of Theorem 3.8. Also verify that latent vectors of P are orthogonal unit vectors.
Example
The starting point for a PCA of an infinite population is a dispersion matrix of the variates, usually Σ or P. Consider four random variables X1, X2, X3, and X4 with covariance matrix
THEOREM
Let Σ be a ( p x p) covariance matrix with latent roots Λ and latent vectors Π. Then Σ-1 possesses latent roots Λ-1and latent vectors Π.
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