[Rd] ordering dataframe for strata() (PR#13830)

eric.vanderwal at usask.ca eric.vanderwal at usask.ca
Tue Jul 14 21:10:14 CEST 2009

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.


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"

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