Identification of structural shocks in Bayesian VEC models with two-state Markov-switching heteroskedasticity
利用两状态马尔可夫转换异方差识别贝叶斯 VEC 模型的结构冲击AI 解读 ↓
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利用两状态马尔可夫转换异方差识别贝叶斯 VEC 模型的结构冲击AI 解读 ↓
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We develop a Bayesian framework for cointegrated structural VAR models identified by two-state Markovian breaks in conditional covariances. The resulting structural VEC specification with Markov-switching heteroskedasticity (SVEC-MSH) is formulated in the so-called B-parameterization, in which the prior distribution is specified directly for the matrix of the instantaneous reactions of the endogenous variables to structural innovations. We discuss some caveats pertaining to the identification conditions presented earlier in the literature on stationary structural VAR-MSH models, and revise the restrictions to actually ensure the unique global identification through the two-state heteroskedasticity. To enable the posterior inference in the proposed model, we design an MCMC procedure, combining the Gibbs sampler and the Metropolis-Hastings algorithm. The methodology is illustrated both with a simulated as well as real-world data examples.
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有意过度识别的局部投影
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紧识别SVAR中基于“软”符号限制的快速后验抽样
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