Obtaining the internal integer codes of a factor XXXX
On 25/03/2013 11:37 AM, Dan Abner wrote:
Hi everyone,
I understand the process of obtaining the internal integer codes for
the raw values of a factor (using as.numeric() as below), but what is
the best way to obtain these codes for the levels() of a factor (since
the as.numeric() results don't really make clear which code maps to
which level)?
fdata<-factor(c("b","b","c","a","b","c"),labels=c("I","II","III"))
fdata
levels(fdata)
as.numeric(fdata)
I thought something like this would make sense and work, but it throws an error:
as.numeric(levels(fdata))
seq_len(length(levels(fdata))) will give you the numeric codes for the levels. They are simply 1:3 in your example above. (Or perhaps I misunderstood your question?) Duncan Murdoch