# Large time-varying parameter VARs

*Gary Koop* () and
*Dimitris Korobilis*

*Journal of Econometrics*, 2013, vol. 177, issue 2, 185-198

**Abstract:**
In this paper, we develop methods for estimation and forecasting in large time-varying parameter vector autoregressive models (TVP-VARs). To overcome computational constraints, we draw on ideas from the dynamic model averaging literature which achieve reductions in the computational burden through the use forgetting factors. We then extend the TVP-VAR so that its dimension can change over time. For instance, we can have a large TVP-VAR as the forecasting model at some points in time, but a smaller TVP-VAR at others. A final extension lies in the development of a new method for estimating, in a time-varying manner, the parameter(s) of the shrinkage priors commonly-used with large VARs. These extensions are operationalized through the use of forgetting factor methods and are, thus, computationally simple. An empirical application involving forecasting inflation, real output and interest rates demonstrates the feasibility and usefulness of our approach.

**Keywords:** Bayesian VAR; Forecasting; Time-varying coefficients; State-space model (search for similar items in EconPapers)

**JEL-codes:** C11 C52 E27 E37 (search for similar items in EconPapers)

**Date:** 2013

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http://www.sciencedirect.com/science/article/pii/S0304407613000845

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**Related works:**

Working Paper: Large Time-Varying Parameter VARs (2012)

Working Paper: Large time-varying parameter VARs (2012)

Working Paper: Large time-varying parameter VARs (2012)

Working Paper: Large Time-Varying Parameter VARs (2012)

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**Persistent link:** https://EconPapers.repec.org/RePEc:eee:econom:v:177:y:2013:i:2:p:185-198

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