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arXiv 1802.08161stat.APstat.ME
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季节隐马尔可夫模型中极大似然估计的相合性

Consistency of the maximum likelihood estimator in seasonal hidden Markov models

Augustin Touron

摘要:

在本文中,我们介绍了隐马尔可夫模型的一个变种,其中的状态之间的转移概率,以及排放分布,不是恒定的时间,但在一个周期性的方式变化。这类模型,我们称之为季节性隐马尔可夫模型(SHMM),在实践中特别有用,因为许多应用都涉及季节性行为。然而,到目前为止,还没有关于这种模型的理论结果。我们表明,在温和的假设下,SHMM是可识别的:我们可以识别的过渡矩阵和发射分布的联合分布的观察期间,状态标签。我们还给出了极大似然估计强相合的充分条件。将这些结果应用于模拟数据,使用期望最大化算法来计算MLE。最后,我们展示了如何SHMM可以用于在现实世界中的应用,通过将我们的模型应用到降水数据,与混合物的指数分布的排放分布。

英文摘要:

In this paper, we introduce a variant of hidden Markov models in which the transition probabilities between the states, as well as the emission distributions, are not constant in time but vary in a periodic manner. This class of models, that we will call seasonal hidden Markov models (SHMM) is particularly useful in practice, as many applications involve a seasonal behaviour. However, up to now, there is no theoretical result regarding this kind of model. We show that under mild assumptions, SHMM are identifiable: we can identify the transition matrices and the emission distributions from the joint distribution of the observations on a period, up to state labelling. We also give sufficient conditions for the strong consistency of the maximum likelihood estimator (MLE). These results are applied to simulated data, using the EM algorithm to compute the MLE. Finally, we show how SHMM can be used in real world applications by applying our model to precipitation data, with mixtures of exponential distributions as emission distributions.

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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