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代码运行环境:
MATLAB2019a

常见问题:
使用MATLAB2018及以下版本时,调用forecast时会报错:“需要字符串标量或字符向量形式的参数名称。”
解决方法:
例如ARMS_Forecast第68行,修改为Predict_dlogY(i+1) = forecast(EstMdl,1,'Y0',aimY(1:i));即可

代码说明:
ARMA_Forecast和ARMA_Order_Select是1组,用了log和差分,再还原
ARMA_Forecast_Diff和ARMA_Order_Select_Diff是1组,只取了差分,没有用还原

20190919  
1.删除了info_val.m文件,改用MATLAB自带的aicbic函数作为计算aic和bic的值的依据。
2.求差分时改用了diff函数,对应修改了一些转置变换
3.删掉了未用到的Options
4.获取到AR,MA的定阶值后,不应+1

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