Hi,
 
Can anyone help me with the following. I have been using R for Monte
Carlo simulations and got some results I couldn't explain. Therefor I
performed following short test:
 
--------------
mean.sds <- NULL
sample.sizes <- 3:30
 
 for(N in sample.sizes){
 dum <- NULL
 for(I in 1:5000){
  x <- rnorm(N,0,1)
  dum <- c(dum,sd(x))
 }
 mean.sds<- c(mean.sds,mean(dum))
}
plot(sample.sizes,mean.sds)
--------------
 
My question is why don't I get 1 as a result from my sd() for small
sample sizes? According to the help, sd() is unbiased, which anyway
would not explain the small offset... Is it something in rnorm()?
 
Thanx,
Roy


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