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2000 Aug 10
1
Problems with levels of factors
Dear R-helpers,
I frequently run into problems when I modify elements of factors (R 1.0.0,
Linux 2.0.25). For example, after splitting a data frame accordinng to
whatever criterion, it might well happen that not all levels of a factor
are present in all new data frames. However, R doesn't seem to care about.
When performing some kind of analysis seperately on the new frames, each
time the unreduced number of levels is present.
That can be very prob...