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Model Selection in Partially Nonstationary Vector Autoregressive Processes with Reduced Rank Structure

John Chao () and Peter Phillips ()

No 1155, Cowles Foundation Discussion Papers from Cowles Foundation for Research in Economics, Yale University

Abstract: The current practice for determining the number of cointegrating vectors, or the cointegrating rank, in a vector autoregression (VAR) requires the investigator to perform a sequence of cointegration tests. However, as was shown in Johansen (1992), this type of sequential procedure does not lead to consistent estimation of the cointegrating rank. Moreover, these methods take as given the correct specification of the lag order of the VAR, though in actual applications the true lag length is rarely known, Simulation studies by Toda and Phillips (1994) and Chao (1993), on the other hand, have shown that test performance of these procedures can be adversely affected by lag misspecification. This paper addresses these issues by extending the analysis of Phillips and Ploberger (1996) on the Posterior Information Criterion (PIC) to a partially nonstationary vector autoregressive process with reduced rank structure. This extension allows lag length and cointegrating rank to be jointly selected by the criterion, and it leads to the consistent estimation of both. In addition, we also evaluate the finite sample performance of PIC relative to existing model selection procedures, BIC and AIC, through a Monte Carlo study. Results here show PIC to perform at least as well and sometimes better than the other two methods in all the cases examined.

Keywords: Cointegrating rank; information criterion; order selection; PIC; reduced rank regression; vector autoregression (search for similar items in EconPapers)
JEL-codes: C32 (search for similar items in EconPapers)
Pages: 47 pages
Date: 1997-07
Note: CFP 992.
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Published in Journal of Econometrics, 91, 1999

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