[R] simple random number generation

[S Ellison]

Since the standard normal distribution goes to infinity in both
directions, you can't have random normal constrained to +-1.5.

You can have _truncated_ standard normal, though, if that's really what
you want. 


+-1.5 is/are the normal quantiles at pnorm(c(-1.5,1.5)). So if we
generate 500 uniformly distributed probabilities in the range
pnorm(c(-1.5,1.5)), and then run qnorm on those,  you should get what
you want:

Try this:

lims<-pnorm(c(-1.5,1.5)) #get the range of probs required
x<-qnorm(runif(500,lims[1],lims[2]))
hist(x)

Steve E.

>>> dxc13 <dxc13 at health.state.ny.us> 07/25/08 12:35 AM >>>

useR's,

I want to randomly generate 500 numbers from the standard normal
distribution, i.e. N(0,1), but I only want them to be generated in the
range
-1.5 to 1.5.  Does anyone have a simple way to do this?

Thanks,

dxc13
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