Re: [R] Linear regression on several groups
Please read the posting guide and include a standalone example. Maybe you want something like the results from lm(weight ~ Time, data = ChickWeight, subset = Diet==1) lm(weight ~ Time, data = ChickWeight, subset = Diet==2) ## ... etc ... Then you could do (m - lm(weight ~ Time*Diet, data = ChickWeight)) To get the Diet==2 coefficients from above you could use something like sum(coef(m)[c((Intercept), Diet2)]) # Intercept sum(coef(m)[c(Time, Time:Diet2)])# Slope Hope this helps a little. Allan On 12/08/2010 17:11, JesperHybel wrote: I have a simple dataset of a numerical dependent Y, a numerical independent X and a categorial variable Z with three levels. I want to do linear regression Y~X for each level of Z. How can I do this in a single command that is without using lm() applied three isolated times? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Linear regression on several groups
hi, maybe an ANCOVA is what you want, which is also done by lm in R lm(y~x*z) Am 12.08.2010 17:11, schrieb JesperHybel: I have a simple dataset of a numerical dependent Y, a numerical independent X and a categorial variable Z with three levels. I want to do linear regression Y~X for each level of Z. How can I do this in a single command that is without using lm() applied three isolated times? -- Eik Vettorazzi Institut für Medizinische Biometrie und Epidemiologie Universitätsklinikum Hamburg-Eppendorf Martinistr. 52 20246 Hamburg T ++49/40/7410-58243 F ++49/40/7410-57790 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Linear regression on several groups
Example is spot on - sr for not providing one myself.
The results you calculate are what I'm looking for.
Would like a function F where I could type:
F(weight ~ Time, data = ChickWeight, SOME ARGUMENT = Diet))
Resulting in
for (i in 1:4){
print(
lm(weight ~ Time, data = ChickWeight, subset = Diet==i)
)
}
I'm simply trying to minimize amount of looping and typing etc.
BR Jesper
--
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__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Linear regression on several groups
Have a look at lmList() in the nlme package.
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
project.org] On Behalf Of JesperHybel
Sent: Friday, August 13, 2010 7:56 AM
To: r-help@r-project.org
Subject: Re: [R] Linear regression on several groups
Example is spot on - sr for not providing one myself.
The results you calculate are what I'm looking for.
Would like a function F where I could type:
F(weight ~ Time, data = ChickWeight, SOME ARGUMENT = Diet))
Resulting in
for (i in 1:4){
print(
lm(weight ~ Time, data = ChickWeight, subset = Diet==i)
)
}
I'm simply trying to minimize amount of looping and typing etc.
BR Jesper
--
View this message in context: http://r.789695.n4.nabble.com/Linear-
regression-on-several-groups-tp2322835p2324154.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-
guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[R] Linear regression on several groups
I have a simple dataset of a numerical dependent Y, a numerical independent X and a categorial variable Z with three levels. I want to do linear regression Y~X for each level of Z. How can I do this in a single command that is without using lm() applied three isolated times? -- View this message in context: http://r.789695.n4.nabble.com/Linear-regression-on-several-groups-tp2322835p2322835.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
