Dear all,
I used "which" to obtain a subset of values from my data.frame.
however, I find that there is a "trace" of the values I have removed.
Any suggestions would be greatly appreciate.
Below is my data:
d <- data.frame( val = 1:10,
group = sample(LETTERS[1:5], 10, repl=TRUE) )
>d
val group
1 1 B
2 2 E
3 3 B
4 4 C
5 5 A
6 6 B
7 7 A
8 8 E
9 9 E
10 10 A
## selecting everything that is not group "A"
d<-d[which(d$group !="A"),]
> d
val group
1 1 B
2 2 E
3 3 B
4 4 C
6 6 B
8 8 E
9 9 E
> levels(d$group)
[1] "A" "B" "C" "E"
## why is group A still reflected here?
Many thanks in advance,
tania
D.phil student
Department of Physiology, Anatomy and Genetics
Oxford University
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