Message-ID: <CACk-te3a4ahStGyQ7VJzvJPjh5QyYBu21OLxnmBc+wX=mtk=uQ@mail.gmail.com>
Date: 2012-10-10T14:40:18Z
From: Bert Gunter
Subject: se's and CI's for fitted lines in multivariate regression analysis
In-Reply-To: <1349876954087-4645703.post@n4.nabble.com>
?predict
Have you read An Inrtroduction to R?
-- Bert
On Wed, Oct 10, 2012 at 6:49 AM, Sigrid <s.stenerud at gmail.com> wrote:
> I?m entirely stumped on this particular issue and really hoping someone has
> some advice for me.
>
> I am running a covariant model in lm I would like to give the standard
> errors or the confidence intervals for the fitted lines. I?ve been using the
> dataset OrangeSprays where I want lines for each level of treatment over the
> covariant ?colpos?. I?ve been able to calculate intercepts and slopes for
> each lines by adding up the parameters, but this does not make sense when
> the comes to the se?s. I?ve run the summary (model) function, but only get
> the differences in standard error between lines. Also by running
> confint(model), I have the same problem.
>
> How can I get standard error per or the CI-interval for each fitted line?
> I?ve attached the coding underneath.
>
> Thank you,
> Sigrid
>
>> data(OrchardSprays)
>> model<-lm(decrease~rowpos+colpos+treatment+treatment:colpos)
>> summary(model)
>
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/se-s-and-CI-s-for-fitted-lines-in-multivariate-regression-analysis-tp4645703.html
> Sent from the R help mailing list archive at Nabble.com.
>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
--
Bert Gunter
Genentech Nonclinical Biostatistics
Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm