Dirichlet ARMA models for compositional time series
Dirichlet ARMA models for compositional time series
复制标题
用于组合时间序列的 Dirichlet ARMA 模型
DOI:
10.1016/j.jmva.2017.03.006
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发表时间:
2017-06
影响因子:
1.6
通讯作者:
Chen Rong
中科院分区:
文献类型:
--
作者:
Zheng Tingguo;Chen Rong
A compositional time series is a multivariate time series in which the observation vector at each time point is a set of proportions that sum to 1. Traditionally, such time series are modeled by taking a log-ratio transformation of the observations and then modeling them with a Gaussian vector autoregressive moving average (ARMA) model. In this paper, a new class of models is proposed by assuming that the proportions follow a time-varying Dirichlet distribution, and that the corresponding time-varying parameters, after a proper transformation, assume an ARMA-type of dynamic structure. The new model is referred to as the Dirichlet autoregressive moving average (DARMA) model. Under this model, after a proper transformation, the original data follow a vector ARMA model with a martingale difference sequence as its noise series. Two specific transformations are studied under the DARMA framework. Estimation procedures are developed and their numerical properties are investigated. Simulation studies and real examples are presented to demonstrate the properties of the proposed models, and comparisons are made with the existing modeling approaches.
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