Adrian Dusa wrote:
Adrian Dusa <dusa.adrian <at> gmail.com> writes:
[...snip...]
f[which(f %in% names(table(f))[table(f) >= 2]), drop=TRUE]
[1] a a
Levels: a
Or, more simple:
f[f %in% names(table(f))[table(f) >= 2], drop=TRUE]
[1] a a
Levels: a
Adrian
Also see the combine.levels function in the Hmisc package.
Frank
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Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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