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

[peter dalgaard]

On Oct 23, 2013, at 20:13 , erinu wrote:

> 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! 
> 

Just hold on to the indices:

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

-pd


> 
> 
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> 
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-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com