arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.09188stat.CO
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包裹拒绝抽样

Ensemble Rejection Sampling

George Deligiannidis, Arnaud Doucet, Sylvain Rubenthaler

摘要:

本文介绍了一种从一类非线性非高斯状态空间模型的潜在状态的后验分布中进行精确模拟的方法--包围拒绝抽样。集合拒绝抽样依赖于使用状态样本的集合构建的高维状态序列的建议。虽然该算法可以被解释为一个拒绝采样方案作用于扩展空间,我们表明,在正则条件下,预期的计算成本,以获得一个确切的样本增加立方的状态序列的长度,而不是指数为标准的拒绝抽样。我们证明了这种方法的抽样状态序列根据后验分布的随机波动率模型和非线性自回归过程。我们还提出了一个应用到罕见事件模拟。

英文摘要:

We introduce Ensemble Rejection Sampling, a scheme for exact simulation from the posterior distribution of the latent states of a class of non-linear non-Gaussian state-space models. Ensemble Rejection Sampling relies on a proposal for the high-dimensional state sequence built using ensembles of state samples. Although this algorithm can be interpreted as a rejection sampling scheme acting on an extended space, we show under regularity conditions that the expected computational cost to obtain an exact sample increases cubically with the length of the state sequence instead of exponentially for standard rejection sampling. We demonstrate this methodology by sampling exactly state sequences according to the posterior distribution of a stochastic volatility model and a non-linear autoregressive process. We also present an application to rare event simulation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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