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Sign Restrictions in Structural Vector Autoregressions: A Critical Review

Structural Vector Autoregressions (SVARs) have become one of the major ways of extracting information about the macro economy. One might cite three major uses of them in macro-econometric research. 1. For quantifying impulse responses to macroeconomic shocks. 2. For measuring the degree of uncertainty about the impulse responses or other quantities formed from them. 3. For deciding on the contribution of different shocks to fluctuations and forecast errors through variance decompositions. To determine this information a VAR is first fitted to summarize the data and then a structural VAR (SVAR) is proposed whose structural equation errors are taken to be the economic shocks. The parameters of these structural equations are then estimated by utilizing the information in the VAR. The VAR is a reduced form which summarizes the data; the SVAR provides an interpretation of the data. As for any set of structural equations, recovery of the structural equation parameters (shocks) requires the use of identification restrictions that reduce the number of "free" parameters in the structural equations to the number that can be recovered from the information in the reduced form.

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Paper provided by Centre for Applied Macroeconomic Analysis, Crawford School of Public Policy, The Australian National University in its series CAMA Working Papers with number 2010-22.

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Length: 37 pages
Date of creation: Jul 2010
Date of revision:
Handle: RePEc:een:camaaa:2010-22
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