Asymptotic properties of multivariate nonstationary processes with applications to autoregressions. (English) Zbl 0705.62082

Tsay, Ruey S.; Tiao, George C.

Ann. Stat. 18, No. 1, 220-250 (1990).

Summary: Asymptotic properties of multivariate time series with characteristic roots on the unit circle are considered. For a vector autoregressive moving average (ARMA) process, we derive the limiting distributions of certain statistics which are useful in understanding nonstationary processes. These distributions are derived in a unified manner for all types of characteristic roots and are expressed in terms of stochastic integrals of Brownian motions.
For applications, we use the limiting distributions to establish the consistency properties of the ordinary least squares (LS) estimates of various autoregressions of a vector process, e.g., the ordinary, forward and shifted autoregressions. For a purely nonstationary vector ARMA(p,q) process, the LS estimates are consistent if the order of the fitted autoregression is p; for a general ARMA model, the limits of the LS estimates exist, but these estimates can only provide consistent estimates of the nonstationary characteristic roots.

MSC:

62M10	Time series, auto-correlation, regression, etc. in statistics (GARCH)
60F17	Functional limit theorems; invariance principles

Keywords:

functional central limit theorem; Asymptotic properties; multivariate time series; characteristic roots on the unit circle; vector autoregressive moving average; limiting distributions; nonstationary processes; stochastic integrals of Brownian motions; consistency properties; ordinary least squares; nonstationary vector ARMA(p,q) process