[R] subset factor?
Hi, I used subset command, like this: grupoP = subset(dados, grupos=='P', select=c(mortos, vivos, doses, percevejos, p)) and the variables in select option are numeric. I tried fit a model with command: ajuste.logit = glm(cbind(mortos,percevejos)~log10(doses), family=binomial(logit), data=grupoP) and the output is: ajuste.logit = glm(cbind(mortos,percevejos)~log10(doses), family=binomial(logit), data=grupoP) Erro em Math.factor(doses) : log10 not meaningful for factors what is wrong with my commands? Why doses aren't numeric? Thanks, -- Silvano Cesar da Costa Departamento de Estatística Universidade Estadual de Londrina Fone: 3371-4346 __ 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] subset factor?
Are you certain they are numeric? Have you tried str() on your data? Sarah On Fri, Jan 14, 2011 at 9:08 AM, Silvano silv...@uel.br wrote: Hi, I used subset command, like this: grupoP = subset(dados, grupos=='P', select=c(mortos, vivos, doses, percevejos, p)) and the variables in select option are numeric. I tried fit a model with command: ajuste.logit = glm(cbind(mortos,percevejos)~log10(doses), family=binomial(logit), data=grupoP) and the output is: ajuste.logit = glm(cbind(mortos,percevejos)~log10(doses), family=binomial(logit), data=grupoP) Erro em Math.factor(doses) : log10 not meaningful for factors what is wrong with my commands? Why doses aren't numeric? Thanks, -- Sarah Goslee http://www.functionaldiversity.org __ 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] subset factor?
On 2011-01-14 06:20, Sarah Goslee wrote: Are you certain they are numeric? Have you tried str() on your data? Sarah Silvano: As Sarah says, do str(dados) to see that 'doses' is NOT numeric. The error message is very clear; it tells you that 'doses' is a factor. My guess is that you imported your data from somewhere and somehow managed to import 'doses' as a factor. My advice is to ALWAYS do an str() after importing/changing data. Peter Ehlers On Fri, Jan 14, 2011 at 9:08 AM, Silvanosilv...@uel.br wrote: Hi, I used subset command, like this: grupoP = subset(dados, grupos=='P', select=c(mortos, vivos, doses, percevejos, p)) and the variables in select option are numeric. I tried fit a model with command: ajuste.logit = glm(cbind(mortos,percevejos)~log10(doses), family=binomial(logit), data=grupoP) and the output is: ajuste.logit = glm(cbind(mortos,percevejos)~log10(doses), family=binomial(logit), data=grupoP) Erro em Math.factor(doses) : log10 not meaningful for factors what is wrong with my commands? Why doses aren't numeric? Thanks, __ 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] subset factor?
Silvano wrote: Hi, I used subset command, like this: grupoP = subset(dados, grupos=='P', select=c(mortos, vivos, doses, percevejos, p)) and the variables in select option are numeric. They may *look* numeric, but are they really? You don't give us enough information to determine that. Either give us a sample of your data with the dput command, or the output of str(grupoP). __ 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.
