Try:
> sex <- factor(sample(c("M", "F"), 10, replace=TRUE), levels=c("M", "F",
"I"))
> sex
[1] F F M F F F M M M F
Levels: M F I
> sex2 <- sex[, drop=TRUE]
> sex2
[1] F F M F F F M M M F
Levels: M F
HTH,
Andy
> From: Neil Leonard
>
> Hi,
>
> I have imported some data to R from stata and my factor
> variables have
> an Indeterminate level which I don't really want. For example the
> variable sex has the levels Male, Female and Indeterminate. There are
> no 'Indeterminate' values in the data. Can somebody tell me
> how to get
> rid of this level as it restricting my cox ph model.
>
> Thanks
> Neil
>
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