Bayesian model comparison for time‐varying parameter VARs with stochastic volatility
含随机波动的时变参数VAR的贝叶斯模型比较AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接以时变参数VAR及其常系数版本为比较对象,并讨论系数和波动率随时间变化,对应VAR与时间序列方向。
含随机波动的时变参数VAR的贝叶斯模型比较AI 解读 ↓
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Summary We develop importance sampling methods for computing two popular Bayesian model comparison criteria, namely, the marginal likelihood and the deviance information criterion (DIC) for time‐varying parameter vector autoregressions (TVP‐VARs), where both the regression coefficients and volatilities are drifting over time. The proposed estimators are based on the integrated likelihood, which are substantially more reliable than alternatives. Using US data, we find overwhelming support for the TVP‐VAR with stochastic volatility compared to a conventional constant coefficients VAR with homoskedastic innovations. Most of the gains, however, appear to have come from allowing for stochastic volatility rather than time variation in the VAR coefficients or contemporaneous relationships. Indeed, according to both criteria, a constant coefficients VAR with stochastic volatility outperforms the more general model with time‐varying parameters.
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