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Vector autoregressions and reduced form representations of DSGE models

  • Federico Ravenna


    (University of California)

Dynamic Stochastic General Equilibrium models are often tested against empirical VARs or estimated by minimizing the distance between the model's and the VAR impulse response functions. These methodologies require that the data-generating process consistent with the DSGE theoretical model has a VAR representation. This paper discusses the assumptions needed for a finite-order VAR(p) representation of any subset of a DSGE model variables to exist. When a VAR(p) is only an approximation to the true VAR, the paper shows that the truncated VAR(p) may return largely incorrect estimates of the impulse response function. The results do not hinge on an incorrect identification strategy or on small sample bias. But the bias introduced by truncation can lead to bias in the identification of the structural shocks. Identification strategies that are equivalent in the true VAR representation perform differently in the approximating VAR.

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Paper provided by Banco de Espa�a in its series Banco de Espa�a Working Papers with number 0619.

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Length: 35 pages
Date of creation: Aug 2006
Date of revision:
Handle: RePEc:bde:wpaper:0619
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