[R] subset factor?

[Sarah Goslee]

Are you certain they are numeric? Have you tried
str() on your data?

Sarah

On Fri, Jan 14, 2011 at 9:08 AM, Silvano <silvano at 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