[R] Sampling from a Population

R. Michael Weylandt michael.weylandt at gmail.com
Sat Dec 8 13:00:32 CET 2012

Hi Lorenzo,

This has the feel of a homework problem, but I will suggest to you
that this is "sampling without replacement" and there exist easy
mathematical formulas (no need to resort to R) to calculate your
desired probability.


On Sat, Dec 8, 2012 at 11:54 AM, Lorenzo Isella
<lorenzo.isella at gmail.com> wrote:
> Dear All,
> I hope this is not too off topic, but I am sure it has to be a one-liner in
> R.
> Suppose you have a population of size N and that you take a random sample of
> n_s individuals out of this population.
> This population includes a subgroup of n_i individuals.
> For any individual in n_i, what is the probability of being included in the
> sample n_s?
> Many thanks.
> Lorenzo
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