| Date: | Tue, 21 Dec 1999 17:04:38 GMT |
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| Reply-To: | Kattamuri.Sarma@RESPONSEINSURANCE.COM |
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| Sender: | "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU> |
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| From: | Kattamuri.Sarma@RESPONSEINSURANCE.COM |
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| Subject: | Re: a question in regression |
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| Content-type: | text/plain; charset=us-ascii |
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Take the partial derivative of Y w.r.t X, which will be something like
a +2bX, ( I am assuming
that you have fitted Y = constant + aX + b*X**2 ) and see how this
behaves
at each plausible value of X. Only from the partial derivative
evaluated at each x, can you tell whether you
have a meaningful equation or not...
Kattamuri Sarma
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