[R] Sampling in R

Noam Friedman noamfrie at qos.net.il
Thu Mar 23 11:52:48 CET 2006

Hi all!

I was wondering if you can help me with a little sampling issue I'm  
having in R.

I have a database with 100 observations.
I need to sample n=9 sample size, 200 times (i.e. get 200 samples of  
size 9).
N (pop. size) =100

Each sample can't contain the same observation more than one time  
(i.e. the program needs to check if the obs. has already been sampled  
into the sample - it it has, it should put it back and sample again  
another obs.)

obviously  I need to do this with replacement.

Then, I need to draw (I think the best is with a histogram) the  
distribution of the mean of each os the 200 samples.

I guess I need to do a loop for the 'sample' function in R.

I could really use your help.


Noam Friedman.

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