中文说明：
AR模型的大作业，涉及到2阶三阶四阶，估算AR模型的系数。
English Description：
The large task of AR model involves 2-order, 3-order and 4-order, and the coefficient of AR model is estimated.
The large task of AR model involves second order, third order and fourth order, and the coefficient
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中文说明：
AR模型的大作业，涉及到2阶三阶四阶，估算AR模型的系数。
English Description：
The large task of AR model involves 2-order, 3-order and 4-order, and the coefficient of AR model is estimated.
AR.m
junfang.m
tidu.m