R help - Dec 2012 - Sampling from a Population

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

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.

Michael

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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