Efficient Bayesian Inference for Multiple Change-Point and Mixture Innovation Models
多重变点与混合创新模型的高效贝叶斯推断AI 解读 ↓
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多重变点与混合创新模型的高效贝叶斯推断AI 解读 ↓
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Time series subject to parameter shifts of random magnitude and timing are commonly modeled with a change-point approach using Chib's algorithm to draw the break dates. We outline some advantages of an alternative approach in which breaks come through mixture distributions in state innovations, and for which the sampler of Gerlach, Carter, and Kohn allows reliable and efficient inference. We show how the same sampler can be used to model shifts in variance that occur independently of shifts in other parameters and how to draw the break dates efficiently when regime durations follow a Poisson process. Finally, we introduce to the time series literature the concept of adaptive Metropolis–Hastings sampling for discrete latent variable models. We develop an easily implemented adaptive algorithm that improves on the work of Gerlach et al. and promises to significantly reduce computing time in a variety of problems including mixture innovation, change-point, regime switching, and outlier detection. The efficiency gains on two models for U.S. inflation and real interest rates are 257% and 341%.