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Time-dependent spectral analysis of epidemiological time-series with wavelets

机译:小波流行病学时间序列的时变频谱分析

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摘要

In the current context of global infectious disease risks, a better understanding of the dynamics of major epidemics is urgently needed. Time-series analysis has appeared as an interesting approach to explore the dynamics of numerous diseases. Classical time-series methods can only be used for stationary time-series (in which the statistical properties do not vary with time). However, epidemiological time-series are typically noisy, complex and strongly non-stationary. Given this specific nature, wavelet analysis appears particularly attractive because it is well suited to the analysis of non-stationary signals. Here, we review the basic properties of the wavelet approach as an appropriate and elegant method for time-series analysis in epidemiological studies. The wavelet decomposition offers several advantages that are discussed in this paper based on epidemiological examples. In particular, the wavelet approach permits analysis of transient relationships between two signals and is especially suitable for gradual change in force by exogenous variables.
机译:在当前全球传染病风险的背景下,迫切需要更好地了解主要流行病的动态。时间序列分析已成为探索多种疾病动态的有趣方法。经典时间序列方法只能用于固定时间序列(统计属性不会随时间变化)。然而,流行病学时间序列通常是嘈杂的,复杂的并且非常不稳定。鉴于这种特殊的性质,小波分析显得特别有吸引力,因为它非常适合于分析非平稳信号。在这里,我们将小波方法的基本属性作为流行病学研究中进行时间序列分析的一种合适而优雅的方法进行回顾。基于流行病学实例,小波分解具有许多优点,本文将对此进行讨论。特别地,小波方法允许分析两个信号之间的瞬态关系,并且特别适合于通过外源变量逐渐改变力。

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