Hi
[EMAIL PROTECTED] napsal dne 02.11.2007 15:16:37: > I am perfectly aware that this question is not an R question, at least > not yet, but I have not succeeded in finding what I want in other > ways, so ... > > What I am looking for are two algorithms, preferabley in Pascal, but > other languages may do. For (a) systematic (complete) permutations > for grouped data with unequal group sizes, and (b) random permutations > for the same kind of data. I know of one source: E. S. Edgington I am not sure if it is what you want but lll <- lapply(split(some vector, group vector), function(x) sample(1:length(x))) gives you a list of systematic permutation of the first vector in each group and you can use it for subsetting your data. for (i in no.of.groups) split(data, group vector)[[i]] [lll[[i]],] Random permutation (if I understand correctly) can be constructed by not exhaustive sampling so you can limit number of samples by size argument to sample function. Regards Petr > (1980): Randomization Tests (program 4.1 and program 4.3), but those > are written in Fortran with a lot of GO TO's which probably would not > be very efficient even if I managed to manually these programs and do > a correct translation. There must be some more modern ones around, > but where? > > I need the algorithms for a program I have written for exploring > structural balance in sociometric group structures. > > Tom > > +----------------------------------------------------------------+ > | Tom Backer Johnsen, Psychometrics Unit, Faculty of Psychology | > | University of Bergen, Christies gt. 12, N-5015 Bergen, NORWAY | > | Tel : +47-5558-9185 Fax : +47-5558-9879 | > | Email : [EMAIL PROTECTED] URL : http://www.galton.uib.no/ | > +----------------------------------------------------------------+ > > ______________________________________________ > [email protected] 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. ______________________________________________ [email protected] 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.
