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ARIMA model

To: s-news@lists.biostat.wustl.edu
Subject: ARIMA model
From: "Jim Zhang" <jimzhang@alumni.brown.edu>
Date: Tue, 20 Feb 2007 22:55:49 +0000
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This must be a rookie question.

When I do ARIMA model,
say the variables are $X_n$, do I have to first substract $X_n$ with
its sample mean?

Thx,



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