练习讲解par(mfrow=c(3,1))ts.plot(s)acf(s)pacf(s)eacf(s)综合时序图、（偏）自相关图和eacf(s)的结果决定尝试ar(1),ma(1),ar(3),ma(3),arma(1,1)这五种模型来对数据进行拟合练习讲解（2）分别进行ar(1),ma(1),ar(3),ma(3),arma(1,1)拟合下面详细说明各模型拟合过程z1-arma(s,order=c(1,0))summary(z1)由于intercept项不显著，于是重新拟合:z1-arma(s,order=c(1,0),include.inte