2
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
--- On Thu, 6/12/12, Lorenz, David wrote:
From: Lorenz, Da
Suharto,
I think that the key is to read the definition of exclude in the
Arguments section:
a vector of values to be excluded when forming the set of levels. This
should be of the same type as x, and will be coerced if necessary.
Because the levels already exist for x as a factor, they are n
I found this part in the documentation of 'factor'.
'factor(x, exclude=NULL)' applied to a factor is a no-operation
unless there are unused levels: in that case, a factor with the
reduced level set is returned. If 'exclude' is used it should
also be a factor with the same leve
