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

[Nordlund, Dan (DSHS/RDA)]

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of erinu
> Sent: Wednesday, October 23, 2013 11:14 AM
> To: r-help at r-project.org
> Subject: [R] How to view un-sampled data from a randomly sampled
> dataset
> 
> 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!
> 
> 

Perhaps something like

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


hope this is helpful,

Dan

Daniel J. Nordlund, PhD
Research and Data Analysis Division
Services & Enterprise Support Administration
Washington State Department of Social and Health Services