On 29/06/2011 4:29 PM, Peter Maclean wrote:
People with more experience in R I need help on this.
I would like to drop observation if they meet certain condition. In this example
I would like to drop group 2 in "n" because the group in "Y" has more than 2
zeroes.
#Example
n<- c(1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,3)
y<- c(2,3,2,3,4,5,6,1,0,0,0,6, 2, 1, 0, 0,9,3)
z<- as.data.frame(cbind(n,y))
colnames(z)<- c("n","y")
The general way to drop observations is to construct a logical vector to
use as an index. Entries which are FALSE are dropped.
Doing that based on your "more than 2 zeroes" rule looks a little
tricky; I think you want to count zeros first (e.g. using by()), then
construct the TRUE/FALSE vector based on that.
Duncan Murdoch
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