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Prior Selection for Vector Autoregressions

Domenico Giannone (), Michele Lenza () and Giorgio Primiceri ()

No ECARES 2012-002, Working Papers ECARES from ULB -- Universite Libre de Bruxelles

Abstract: Vector autoregressions (VARs) are flexible time series models that can capture complex dynamic interrelationships among macroeconomic variables. However, their dense parameterization leads to unstable inference and inaccurate out-of- sample forecasts, particularly for models with many variables. A potential solution to this problem is to use informative priors, in order to shrink the richly parameterized unrestricted model towards a parsimonious naïve benchmark, and thus reduce estimation uncertainty. This paper studies the optimal choice of the informativeness of these priors, which we treat as additional parameters, in the spirit of hierarchical modeling. This approach is theoretically grounded, easy to implement, and greatly reduces the number and importance of subjective choices in the setting of the prior. Moreover, it performs very well both in terms of out-of-sample forecasting, and accuracy in the estimation of impulse response functions.

New Economics Papers: this item is included in nep-ecm and nep-ets
Date: 2012-01
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Journal Article: Prior Selection for Vector Autoregressions (2015) Downloads
Working Paper: Prior Selection for Vector Autoregressions (2012) Downloads
Working Paper: Prior selection for vector autoregressions (2012) Downloads
Working Paper: Prior Selection for Vector Autoregressions (2012) Downloads
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