On Wed, 2009-10-21 at 17:35 +0200, Caro B. wrote: > Dear R-Help-Team, > > > I would like to cluster my data using the ward-method. In several papers I > read (e.g. Bahrenberg) that it is neccesary to use the "squared euclidean > distance" with the ward-method. Unfortunatelly I cannot find this term in r > as a method for measuring the distance. > > Does anybody have an idea?
Compute the Euclidean distance then square the numbers to undo the sqrt applied within dist. set.seed(1) dat <- data.frame(X1 = runif(10), X2 = runif(10)) d.euc <- dist(dat) d.sqeuc <- d.euc^2 class(d.sqeuc) ## still a dist object I have no idea what/who Bahrenberg is or whether/why it is advisable to use this sq Euclidean with Ward's method; in my field I've seen Ward's method used with all sorts of distance coefficients... HTH G > > Thanks in advance, > Carolin > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% ______________________________________________ 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.
