Extended Yule-Walker Identification of Varma Models with Single- or Mixed-Frequency Data
30 Pages Posted: 13 Jan 2016 Last revised: 5 Jan 2018
Date Written: April 13, 2016
Chen and Zadrozny (1998) developed the linear extended Yule-Walker (XYW) method for determining the parameters of a vector autoregressive (VAR) model with available covariances of mixed-frequency observations on the variables of the model. If the parameters are determined uniquely for available population covariances, then, the VAR model is identified. The present paper extends the original XYW method to an extended XYW method for determining all ARMA parameters of a vector autoregressive moving-average (VARMA) model with available covariances of single- or mixed-frequency observations on the variables of the model. The paper proves that under conditions of stationarity, regularity, miniphaseness, controllability, observability, and diagonalizability on the parameters of the model, the parameters are determined uniquely with available population covariances of single- or mixed-frequency observations on the variables of the model, so that the VARMA model is identified with the single- or mixed-frequency covariances.
Keywords: block-Vandermonde eigenvectors of block-companion state-transition matrix of state-space representation, matrix spectral factorization
JEL Classification: C32, C80
Suggested Citation: Suggested Citation