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johnpark1 发表于 2015-10-18 14:55 Unless I'm missing something, a simple by statement would do: Proc reg data=xyz noprint outest=o ...
zhao_amy_PKU 发表于 2015-10-21 11:20 想请教您,如果我是做arima的分析呢? 可以用 proc arima data=aaa; by companyID;