说明：  在统计学角度来看，时间序列分析是统计学中的一个重要分支, 是基于随机过程理论和数理统计学的一种重要方法和应用研究领域. 时间序列按其统计特性可分为平稳性序列和非平稳性序列.
(From the perspective of statistics, time series analysis is an important branch of statistics and an important method and applied research field based on stochastic process theory and mathematical statistics. Time series can be divided into stationary series and non-stationary series according to their statistical characteristics.)