一些AR模型的初级材料，希望对初学者有用-AR model for a number of primary materials, and they hope to be useful for beginners

AR自回归模型，主要介绍时间序列分析中重要的一个模型。-AR autoregression model, time series analysis introduces an important model.

可以建立任意阶的ar模型画出自相关和偏相关的拖尾和结尾图，并且求出参数估计和残差序列-Can establish arbitrary order AR model painting correlation and partial correlation and tail end of figure, and calculate parameter estimation and the residual sequence