[R] plot - central limit theorem
Duncan Murdoch
murdoch at stats.uwo.ca
Wed Oct 15 22:00:32 CEST 2008
On 10/15/2008 3:48 PM, Jörg Groß wrote:
> Hi,
>
>
> Is there a way to simulate a population with R and pull out m samples,
> each with n values
> for calculating m means?
>
> I need that kind of data to plot a graphic, demonstrating the central
> limit theorem
> and I don't know how to begin.
The easiest way to do this is to put the simulations into a matrix, and
calculate row means (or column means). For example:
par(mfrow=c(2,2))
m <- 10000
for (n in c(1,2,4,8)) {
sims <- matrix(runif(n*m), ncol=n)
means <- rowMeans(sims)
hist(means, main=paste("n = ", n), xlim=c(0,1))
}
Duncan Murdoch
>
> So, perhaps someone can give me some tips and hints how to start and
> which functions to use.
>
>
>
> thanks for any help,
> joerg
>
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