On Identification of Bayesian DSGE Models

Gary Koop, Mohammad Pesaran and Ronald Smith

Cambridge Working Papers in Economics from Faculty of Economics, University of Cambridge

Abstract: In recent years there has been increasing concern about the identification of parameters in dynamic stochastic general equilibrium (DSGE) models. Given the structure of DSGE models it may be difficult to determine whether a parameter is identified. For the researcher using Bayesian methods, a lack of identification may not be evident since the posterior of a parameter of interest may differ from its prior even if the parameter is unidentified. We show that this can even be the case even if the priors assumed on the structural parameters are independent. We suggest two Bayesian identification indicators that do not suffer from this difficulty and are relatively easy to compute. The first applies to DSGE models where the parameters can be partitioned into those that are known to be identified and the rest where it is not known whether they are identified. In such cases the marginal posterior of an unidentified parameter will equal the posterior expectation of the prior for that parameter conditional on the identified parameters. The second indicator is more generally applicable and considers the rate at which the posterior precision gets updated as the sample size ( T ) is increased. For identified parameters the posterior precision rises with T , whilst for an unidentified parameter its posterior precision may be updated but its rate of update will be slower than T . This result assumes that the identified parameters are -consistent, but similar differential rates of updates for identified and unidentified parameters can be established in the case of super consistent estimators. These results are illustrated by means of simple DSGE models.

Keywords: Bayesian identification; DSGE models; posterior updating; New Keynesian Phillips Curve. (search for similar items in EconPapers)
JEL-codes: C11 C15 E17 (search for similar items in EconPapers)
Date: 2011-03-30
New Economics Papers: this item is included in nep-cba and nep-dge
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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Related works:
Journal Article: On Identification of Bayesian DSGE Models (2013)
Working Paper: On Identification of Bayesian DSGE Models (2011)
Working Paper: On Identification of Bayesian DSGE Models (2011)
Working Paper: On Identification of Bayesian DSGE Models (2011)
Working Paper: On Identification of Bayesian DSGE Models* (2011)
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Persistent link: https://EconPapers.repec.org/RePEc:cam:camdae:1131

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