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Question: Suppose that zt is a k-dimensional weakly stationary, zero-mean time series following the VARMA(2,q) model
where {at} is a white noise series with positive-definite covariance matrix Σa. Let Γj be the lag-j autocovariance matrix of zt. (a) Consider the VAR(2) fitting
Show that the ordinary LS estimates of Φi(0) (i=1,2) satisfy the system of equations
(b) Let at(0) be the residual of the fitted VAR(2) model via the ordinary LS method. Discuss The properties of the autocovariance matrices of at(0) when q = 0 and when q = 1.
(c) Consider the model
Show that the ordinary LS estimates of Φi(0) satisfy the systems of equations
(d) Let a(1)t be the residual of the LS fit of the model in part (c).
Discuss the properties of the auto covariance matrices of a(1)t when q = 0, 1, and 2.
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