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, 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,
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