Resampling question

Nordlund, Dan (DSHS/RDA) · 2012-05-11T01:10:45Z

> -----Original Message----- > From: r-help-bounces at r-project.org [mailto:r-help-bounces at r- > project.org] On Behalf Of Vikram Chhatre > Sent: Thursday, May 10, 2012 4:57 PM > To: r-help at r-project.org > Subject: [R] Resampling question > > Hello - > > I have a population of 100 individuals that I would like to bootstrap > 10 times, every time removing 5 *different* individuals. > > So far, I have done the following: > > pop > replicate(10,

Nordlund, Dan (DSHS/RDA)

Thu, May 10, 2012 6:10 PM

What you are doing is probably more appropriately called a jack-knife, rather than bootstrap.  Be that as it may, your approach will not prevent someone being dropped more than once.  You might randomly select 50 people without replacement and then drop them 5 at a time from the original population

to_drop <- sample(100,50,replace=FALSE)
rep1 <- pop[-to_drop[1:5],]
rep2 <- pop[-to_drop[6:10],] 
...

I will let you decide how you want automate this.

Dan


Daniel J. Nordlund
Washington State Department of Social and Health Services
Planning, Performance, and Accountability
Research and Data Analysis Division
Olympia, WA 98504-5204

Resampling question

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