Following theorem 66 prove that the reciprocal


Following Theorem 6.6 prove that the reciprocal proportionality model (Section 6.4.1) is invariant with respect to scaling of the observed random variables.

THEOREM 6.6

Let X he a random vector with nonsingular covariance matrix Σ. Then the weighted covariance matrix Σ* = Ψ-1/2 Σ Ψ-1/2 is invariant under a scale transformation  of X.

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Basic Statistics: Following theorem 66 prove that the reciprocal
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