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Identification of SVAR Models by Combining Sign Restrictions With External Instruments

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  • Robin Braun
  • Ralf Brüggemann

Abstract

We discuss combining sign restrictions with information in external instruments (proxy variables) to identify structural vector autoregressive (SVAR) models. In one setting, we assume the availability of valid external instruments. Sign restrictions may then be used to identify further orthogonal shocks, or as an additional piece of information to pin down the shocks identified by the external instruments more precisely. In a second setting, we assume that proxy variables are only “plausibly exogenous” and suggest various types of inequality restrictions to bound the relation between structural shocks and the external variable. This can be combined with conventional sign restrictions to further narrow down the set of admissible models. Within a proxy-augmented SVAR, we conduct Bayesian inference and discuss computation of Bayes factors. They can be useful to test either the sign- or IV restrictions as overidentifying. We illustrate the usefulness of our methodology in estimating the effects of oil supply and monetary policy shocks.

Suggested Citation

  • Robin Braun & Ralf Brüggemann, 2023. "Identification of SVAR Models by Combining Sign Restrictions With External Instruments," Journal of Business & Economic Statistics, Taylor & Francis Journals, vol. 41(4), pages 1077-1089, October.
    • Handle: RePEc:taf:jnlbes:v:41:y:2023:i:4:p:1077-1089
    DOI: 10.1080/07350015.2022.2104857
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    Cited by:

    1. Salzmann, Leonard, 2024. "Do Survey Data Help Identify Supply and Demand Shocks in Sign-restricted SVARs?," EconStor Preprints 289576, ZBW - Leibniz Information Centre for Economics.
    2. Bruns, Martin & Lütkepohl, Helmut, 2024. "Heteroskedastic proxy vector autoregressions: An identification-robust test for time-varying impulse responses in the presence of multiple proxies," Journal of Economic Dynamics and Control, Elsevier, vol. 161(C).
    3. Lukas Berend & Jan Pruser, 2024. "The Transmission of Monetary Policy via Common Cycles in the Euro Area," Papers 2410.05741, arXiv.org, revised Oct 2024.
    4. Hernández, Juan R. & Ventosa-Santaulària, Daniel & Valencia, J. Eduardo, 2024. "Global supply chain inflationary pressures and monetary policy in Mexico," Emerging Markets Review, Elsevier, vol. 58(C).

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