From eric.vanderwal at usask.ca  Tue Jul 14 21:10:14 2009
From: eric.vanderwal at usask.ca (eric.vanderwal at usask.ca)
Date: Tue, 14 Jul 2009 21:10:14 +0200 (CEST)
Subject: [Rd] ordering dataframe for strata() (PR#13830)
Message-ID: <20090714191015.973162830319@mail.pubhealth.ku.dk>

I've been using strata(sampling) and found that if the dataframe to be 
sampled ("data") consists of repeated measures that are not sorted in 
order the run will fail on a given stratum.  Ordering the dataframe 
prior to using strata() eliminates this problem.

Thanks,
Eric

-- 
Eric Vander Wal
Ph.D. Candidate
University of Saskatchewan, Department of Biology,
112 Science Place, Saskatoon, SK., S7N 5E2

"Pluralitas non est ponenda sine neccesitate"



[Rd] ordering dataframe for strata() (PR#13830)
eric.vanderwal at usask.ca