On Wed, 2009-05-27 at 08:39 -0400, stephen sefick wrote: > It depends on what you are after. I am by no means a wunderkind when > it comes to transformation, but in the package vegan type > ?wisconsin > and that should give you a start, but if you know what > transformations you would like to preform then apply should do what > you need with whatever transformation you are trying to use.
decostand provides (mostly) standardisations not transformations, it even says so. What Holger is looking for is something like a Box Cox transform for bivariate normality but to instead achieve multivariate normality. That is a different kettle of fish to what decostand tries to do. HTH G > > Stephen Sefick > > On Wed, May 27, 2009 at 5:26 AM, Hollix <holger.steinm...@web.de> wrote: > > > > Hello folks, > > > > many multivariate anayses (e.g., structural equation modeling) require > > multivariate normal distributions. > > Real data, however, most often significantly depart from the multinormal > > distribution. Some researchers (e.g., Yuan et al., 2000) have proposed a > > multivariate transformation of the variables. > > > > Can you tell me, if and how such a transformation can be handeled in R? > > > > Thanks in advance. > > With best regards > > Holger > > > > > > --------------- > > Yuan, K.-H., Chan, W., & Bentler, P. M. (2000). Robust transformation with > > applications to structural equation modeling. British Journal of > > Mathematical and Statistical Psychology, 53, 31–50. > > -- > > View this message in context: > > http://www.nabble.com/Multivariate-Transformations-tp23739013p23739013.html > > Sent from the R help mailing list archive at Nabble.com. > > > > ______________________________________________ > > 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 %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%
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