At 03:54 PM 3/8/2008, David Winsemius wrote: >"Robert A. LaBudde" <[EMAIL PROTECTED]> wrote in >news:[EMAIL PROTECTED]: > > > Given a set of data with a number of variables plus a response, I'd > > like to obtain a randomized subset of the rows such that the > > marginal proportions of each variable are maintained closely in the > > subset to that of the dataset, and possibly maintaining as well the > > two-factor interaction marginal proportions as well for some pairs. > > > > This must be a common problem in data mining, but I don't seem to be > > able to locate the proper library or function for doing this in R. > > > > Thanks for any help. > >Have you looked at the "sampling" package? I have never used it, but the >strata() function appears to be capable.
Thank you for pointing out this package and function. It is going to be very useful. I'll have to look into how I'm searching R, as 'sampling' and 'stratified' should have turned this up. I will spend some time looking at how strata() works to see how well it handles the problems I'm looking at. Thanks again. ================================================================ Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: [EMAIL PROTECTED] Least Cost Formulations, Ltd. URL: http://lcfltd.com/ 824 Timberlake Drive Tel: 757-467-0954 Virginia Beach, VA 23464-3239 Fax: 757-467-2947 "Vere scire est per causas scire" ______________________________________________ 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.
