Identifying Structural Vector Autoregressions Via Changes in Volatility

37 Pages Posted: 12 Dec 2012

See all articles by Helmut Luetkepohl

Helmut Luetkepohl

German Institute for Economic Research (DIW Berlin)

Date Written: December 4, 2012

Abstract

Identification of shocks of interest is a central problem in structural vector autoregressive (SVAR) modelling. Identification is often achieved by imposing restrictions on the impact or long-run effects of shocks or by considering sign restrictions for the impulse responses. In a number of articles changes in the volatility of the shocks have also been used for identification. The present study focuses on the latter device. Some possible setups for identification via heteroskedasticity are reviewed and their potential and limitations are discussed. Two detailed examples are considered to illustrate the approach.

Keywords: Markov switching model, vector autoregression, heteroskedasticity, vector GARCH, conditional heteroskedasticity

JEL Classification: C32

Suggested Citation

Luetkepohl, Helmut, Identifying Structural Vector Autoregressions Via Changes in Volatility (December 4, 2012). DIW Berlin Discussion Paper No. 1259, Available at SSRN: https://ssrn.com/abstract=2188433 or http://dx.doi.org/10.2139/ssrn.2188433

Helmut Luetkepohl (Contact Author)

German Institute for Economic Research (DIW Berlin) ( email )

Mohrenstraße 58
Berlin, 10117
Germany

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