Define the random vector use theorem

Assignment Help Basic Statistics

Reference no: EM131084519

In this problem, we extend the proof of Theorem 5.16 to the case when A is m × n with m _X = 0.

(a) Prove there exists an (n - m) × n matrix of rank n-m with the property that A' = 0.

(b) Let = ^-1_X and define the random vector Use Theorem 5.16 for the case m = n to argue that Y¯ is a Gaussian random vector.

(c) Find the covariance matrix of . Use the result of Problem 5.7.8 to show that Y and Yˆ are independent Gaussian random vectors

Theorem 5.16

Given an n-dimensional Gaussian random vector X with expected valueµ X and covariance CX, and an m × n matrix A with rank(A) = m,

Is an m-dimensional Gaussian random vector with expected value µ_Y = Aµ_X + b and covariance CY = AC_XA'

Problem 5.7.8

An n-dimensional Gaussian vector W has a block diagonal covariance matrix where CX is m × m, C_Y is (n - m) × (n - m). Show that W can be written in terms of component vectors X and Y in the form such that X and Y are independent Gaussian random vectors

Reference no: EM131084519

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