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用ac和pac进行arima模型的识别问题!!
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老师的描述是 it seems it is a random walk. The PAC decay slowly. The first coefficient is large but the second and beyond AC coefficient decay to 0 quite rapidly.
但是为啥我看图觉得是AC decay slo ...
2015-3-31 10:57 - Aaaathena - Stata专版