The funciton c() works differently for strings and for factors:
For strings:
> l = c('a', 'b')
> l
[1] "a" "b"
For factors:
> l = c(factor('a'), factor('b'))
> l
[1] 1 1
What should be the right technique for merging factors?
--
Svetlana Eden Biostatistician II School of Medicine
Department of Biostatistics Vanderbilt University
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