[R] Akaike weight in R
I am using lm simulation in R and try to find the AICc and Akaike weight of the model. I searched out that using package AICcmodavg AICc is easily to get. I wonder how can I get the Akaike weight, any function I can use to generate it? Thanks in advance. Sunny [[alternative HTML version deleted]] __ 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] Akaike weight in R
Hi Graham, Appreciate for your help, but actually I've already looked at this website, and wasn't success yet. 1st, I cannot run *W = exp(-0.5 * Delta) / sum(exp(-0.5 * Delta))* in the R. *W - exp(-0.5 * Delta) / sum(exp(-0.5 * Delta))* *note: Delta means AIC difference between models.* ** I don't know why but always showing 1 even I changed Delta. Also, I couldn't find OAD package, where can I get one? Would be wonderfully appreciated. Thanks in advance, Odette On Fri, Dec 19, 2008 at 8:33 PM, Graham Smith myotis...@gmail.com wrote: Odette Wondering how can I generate Akaike weight with R? I know the description, but is there any function to generate by R on the web-site or R library? I am using GLM or GLMM (family=binomial), so would be appreciated if you help me. You could have a look at this. http://bm2.genes.nig.ac.jp/RGM2/R_current/library/aod/man/summary.aic.html Which is in the OAD package Graham [[alternative HTML version deleted]] __ 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] Akaike weight in R
Seems pretty clear from a quick glance at that page (and in retrospect, even from the URL itself) that Graham misspelled the package name, Try looking for package, aod (without any caps.) -- David Winsemius On Dec 21, 2008, at 5:17 AM, Odette Gaston wrote: Hi Graham, Appreciate for your help, but actually I've already looked at this website, and wasn't success yet. 1st, I cannot run *W = exp(-0.5 * Delta) / sum(exp(-0.5 * Delta))* in the R. *W - exp(-0.5 * Delta) / sum(exp(-0.5 * Delta))* *note: Delta means AIC difference between models.* ** I don't know why but always showing 1 even I changed Delta. Also, I couldn't find OAD package, where can I get one? Would be wonderfully appreciated. Thanks in advance, Odette On Fri, Dec 19, 2008 at 8:33 PM, Graham Smith myotis...@gmail.com wrote: Odette Wondering how can I generate Akaike weight with R? I know the description, but is there any function to generate by R on the web-site or R library? I am using GLM or GLMM (family=binomial), so would be appreciated if you help me. You could have a look at this. http://bm2.genes.nig.ac.jp/RGM2/R_current/library/aod/man/summary.aic.html Which is in the OAD package Graham [[alternative HTML version deleted]] __ 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.
Re: [R] Akaike weight in R
Seems pretty clear from a quick glance at that page (and in retrospect, even from the URL itself) that Graham misspelled the package name, Try looking for package, aod (without any caps.) Yep, mea culpa (and I have probably spelt that wrong as well), it was quick after thought as I almost just gave the link to the page. Sorry for the confusion. Graham __ 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] Akaike weight in R
Hi folks, Wondering how can I generate Akaike weight with R? I know the description, but is there any function to generate by R on the web-site or R library? I am using GLM or GLMM (family=binomial), so would be appreciated if you help me. Thanks for your contributions in advance, Regards, Odette [[alternative HTML version deleted]] __ 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] Akaike weight in R
Odette Wondering how can I generate Akaike weight with R? I know the description, but is there any function to generate by R on the web-site or R library? I am using GLM or GLMM (family=binomial), so would be appreciated if you help me. You could have a look at this. http://bm2.genes.nig.ac.jp/RGM2/R_current/library/aod/man/summary.aic.html Which is in the OAD package Graham __ 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] Akaike weight in R
I'm pretty sure you have to work it out yourself. Here is an example of how
you would tabulate the AIC weights from three models (check that my
calculations are correct before using this yourself!).
Basically model.name$aic will cut out the AIC values then write a formula to
calculate the weights...
m1-glm(trantot~unimpgrass+impgrass,family=poisson,data=bbs[bbs$species==unique(bbs$species)[1],])
m2-glm(trantot~marginwidth,family=poisson,data=bbs[bbs$species==unique(bbs$species)[1],])
m3-glm(trantot~impgrass,family=poisson,data=bbs[bbs$species==unique(bbs$species)[1],])
aics-data.frame(paste(m,1:3,sep=),c(m1$aic,m2$aic,m3$aic),row.names=NULL)
colnames(aics)-c(model,AIC)
aics-aics[order(-aics$AIC),]
for(i in 1:dim(aics)[1]){
aics$diff[i]-aics$AIC[1]-aics$AIC[i]}
aics$wi-2.71828182845904523536^(-0.5*aics$diff)
aics$aic.weights-aics$wi/sum(aics$wi)
- Original Message -
From: Odette Gaston odette.gas...@gmail.com
To: r-help@r-project.org
Sent: Friday, December 19, 2008 11:26 AM
Subject: [R] Akaike weight in R
Hi folks,
Wondering how can I generate Akaike weight with R? I know the
description,
but is there any function to generate by R on the web-site or R library?
I am using GLM or GLMM (family=binomial), so would be appreciated if you
help me.
Thanks for your contributions in advance,
Regards,
Odette
[[alternative HTML version deleted]]
__
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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.
__
R-help@r-project.org mailing list
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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.
Re: [R] Akaike weight in R
Try AICtab in the bbmle package - Original Message - From: Odette Gaston odette.gas...@gmail.com To: r-help@r-project.org Sent: Friday, December 19, 2008 11:26 AM Subject: [R] Akaike weight in R Hi folks, Wondering how can I generate Akaike weight with R? I know the description, but is there any function to generate by R on the web-site or R library? I am using GLM or GLMM (family=binomial), so would be appreciated if you help me. Thanks for your contributions in advance, -- View this message in context: http://www.nabble.com/Akaike-weight-in-R-tp21089767p21091392.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.
