A comparison of estimation methods for vector linear time series models
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Akaike (1973) showed, in the case of scalar autoregressive-moving average models, that the estimates obtained by an application of the Newton-Raphson algorithm to the approximate likelihood function are the same as those obtained by Hannan (1969). By making use of the properties of tensor products, this paper extends these ideas to show that, in the case of vector linear time series models, the estimates obtained by the application of the Newton-Raphson procedure are identical to those derived by Nicholls (1976). Consequently the estimates obtained from the Newton-Raphson algorithm, in the case of vector models, are consistent, asymptotically normal and efficient.