[R] How to view un-sampled data from a randomly sampled dataset

[erinu]

Hi there-

I have a 150 row dataset (data). I create "y" a randomly sampled (without
replacement) set number of observations (40):

y<-data[sample(1:nrow(data),40,replace=FALSE),]

I would like to make a new variable "x" that contains the leftover
non-sampled 110 observations.  I am sure there is a fairly easy way to do
this.

Any help would be greatly appreciated.

THANKS! 



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