Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/313885 
Year of Publication: 
2025
Series/Report no.: 
DIW Discussion Papers No. 2110
Publisher: 
Deutsches Institut für Wirtschaftsforschung (DIW), Berlin
Abstract: 
This paper analyzes possibly time-varying shock transmission in structural vector autoregressive (VAR) models when the reduced-form VAR coefficients are time-invariant and the shocks are identified through non-Gaussianity. To check for possible time-variation in the impulse responses, we propose Wald tests for two situations: (1) homoskedastic and (2) heteroskedastic structural shocks. For the latter case, the challenge is to ensure that the test does not indicate time-varying impulse responses if the changes are due only to changes in the variances of the shocks. To illustrate the usefulness of the tests, they are applied to an empirical model of the crude oil market. They support time-varying shock transmission reflected in impulse response functions that change over time.
Subjects: 
Structural vector autoregression
independent component analysis
non-Gaussian shocks
structural break tests
heteroskedasticity
JEL: 
C32
Document Type: 
Working Paper

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