Parameterization of Continuous Time Autoregressive Models for Irregularly Sampled Time Series Data
不规则采样时间序列的连续时间自回归模型参数化AI 解读 ↓
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不规则采样时间序列的连续时间自回归模型参数化AI 解读 ↓
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SUMMARY An increasingly valuable tool for modelling irregularly sampled time series data is the continuous time autoregressive model. The natural parameters in this model are the coefficients of the linear stochastic differential equation describing the process which gives rise to the data. A transformation of these parameters is introduced, based on the Cayley–Hamilton transformation. The new parameter space is identical with that of discrete time autoregressive models. The model is also modified by the introduction of prescribed moving average terms. The resulting modelling improvements include rapid and reliable convergence of parameter estimates and the ability to select the model order by testing whether the highest order coefficient is 0. A geophysical and a medical application illustrate the detection of periodicities in data by using the spectrum of the fitted model.