[R] A programming question - is what I want to do possible in R?
jim holtman
jholtman at gmail.com
Mon Sep 28 14:02:06 CEST 2009
nTime <- 15 # how many samples to take
randomSamples <- lapply(1:2000, function(){
largeDF[sample(nrow(largeDF), nTimes),]
})
This will create a list of 2000 dataframes with the samples
On Sun, Sep 27, 2009 at 10:45 PM, ewaters <ewaters at nchecr.unsw.edu.au> wrote:
>
> I have a large data frame, 77 rows, with 10 columns. Each row represents a
> unique individual with 10 characteristics, some of which are categorical
> factors and some continuous numeric variables. Each of the ten variables is
> important (the 10 columns obviously correspond to the individuals of
> interest). Importantly, this data set represents a population (not sample)
> of people with a certain medical condition.
>
> What I want to do is to select 2000 random samples of between 2 and 24
> individuals, preserving all the information.
>
> I can easily write loops that will sample from 1:77 2 - 24 times, what I
> really want to know is there any way to easily link the output of loops like
> that to the data set so I don't have to trawl through and do it manually
> 2000 times?
>
> Any advice on whether I should even attempt that in R, or try some sort of
> hash table in C or somewhere, would be appreciated.
> --
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> Sent from the R help mailing list archive at Nabble.com.
>
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--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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