中文说明：该文介绍了时间序列经典方法，ARMA，ARIMA，AR模型用于解决各种平稳预测问题，并且附上了相应的程序，方便读者运用
English Description：
This paper introduces the classical methods of time series, ARMA, ARIMA and AR models, which are used to solve all kinds of stationary prediction problems, and the corresponding programs are attached for the convenience of readers