Frédéric Chiroleu wrote: > PS : Be careful with function dudi.pca() from ade4 ; in values, "norm" > doesn't give you what is written in the help page : "norm" returns the > vector of standard deviations of initial variables when you choose > "normed" PCA and the vector of standard deviations of normed variables, > ie 1, when you choose non "normed" PCA. We contacted authors of the > package unsuccessly to rectify the information. > > Dear Frederic, AB Dufour told me that you send it an email, but it would be better to send an email to the adelist, as suggested in the DESCRIPTION file of the package. BTW, this is a problem in the doc, that we will correct. If you consider: dudi1<- dudi.pca(X) dudi&$norm is a vector of values so that dudi1$tab[i,j] = (X[i,j]-dudi1$center[j])/dudi1$norm[j]
There is no bug, just a problem in the doc. Your "be careful with function dudi.pca" is a little bit exagerated I think. We will correct it but there is sometimes some delay between a user request and its implementation in the package. Note that we have other activities than the development and the maintenance of ade4 (we have other scientific projects, to teach, to write papers, reviewing activities... like others) and sometimes, we forget to answer to an email... sorry. Our group provide free softwares, free documentation and teaching ressources for ecologists since a long time. This is a free contribution, and I think that it merits more consideration than what your email suggests. Cheers, -- Stéphane DRAY ([EMAIL PROTECTED] ) Laboratoire BBE-CNRS-UMR-5558, Univ. C. Bernard - Lyon I 43, Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France Tel: 33 4 72 43 27 57 Fax: 33 4 72 43 13 88 http://biomserv.univ-lyon1.fr/~dray/ ______________________________________________ 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.
