Dear R-users,
I am looking for an elegant way to change some levels of a factor column
in data frame according to a condition.
Lets look at the following data frame:
> data.frame(crit1=gl(2,5), crit2=factor(letters[1:10]), x=rnorm(10))
crit1 crit2 x
1 1 a -1.06957692
2 1 b 0.24368402
3 1 c -0.24958322
4 1 d -1.37577955
5 1 e -0.01713288
6 2 f -1.25203573
7 2 g -1.94348533
8 2 h -0.16041719
9 2 i -1.91572616
10 2 j -0.20256478
Now I would like to find for each level in crit1 the two smallest values
of x and change the levels of crit2 to "small", so the result would look
like this:
crit1 crit2 x
1 1 small -1.06957692
2 1 b 0.24368402
3 1 c -0.24958322
4 1 small -1.37577955
5 1 e -0.01713288
6 2 f -1.25203573
7 2 small -1.94348533
8 2 h -0.16041719
9 2 small -1.91572616
10 2 j -0.20256478
Thank you for advice!
Markus Gesmann
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