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.ise...@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 > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
