Thank you very much. The advice I followed (and which, for some reason, I do
not see here right now) was to use 'droplevels'. I needed the command for
several variables at the same time, so this was very convenient.
>
Hello,
Have you tried 'droplevels':
test <-data.frame(a=as.factor(rep(c("f1","f
Hi,
I have exactly the same question (how to remove empty levels in my subset),
but in my case the factor command does not work, because my dataframe is not
atomic
> Try this:
>
> test2$a <- factor(test2$a)
>
R gives me the error message:
Error in sort.list(y) : 'x' must be atomic for 'sort.lis
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