Let F be the distribution function of Y, PSI the standard normal distribution anf IPSI it's inverse. Let f(x) = IPSI(F(x)). It is not difficult to see that f(Y) has standard normal distribution. So you can replace F with the empirical distribution and IPSI is the qnorm function of R.
--- On Wed, 25/6/08, Indermaur Lukas <[EMAIL PROTECTED]> wrote: > From: Indermaur Lukas <[EMAIL PROTECTED]> > Subject: [R] help_transformation > To: [EMAIL PROTECTED] > Received: Wednesday, 25 June, 2008, 9:56 PM > heya, > i am fitting linear mixed effect model to a response Y. Y > shows an s-shaped distribution when using QQ-plots (some > zero values and some very high values). hence, which > transformation should i apply that Y follows a normal > distribution? any r-function/package available to do this? > > thanks for any hint, > regards, > lukas > > > > °°° > Lukas Indermaur, PhD student > eawag / Swiss Federal Institute of Aquatic Science and > Technology > ECO - Department of Aquatic Ecology > Überlandstrasse 133 > CH-8600 Dübendorf > Switzerland > > Phone: +41 (0) 71 220 38 25 > Fax : +41 (0) 44 823 53 15 > Email: [EMAIL PROTECTED] > www.lukasindermaur.ch <http://www.lukasindermaur.ch/> > > > > > > ______________________________________________ > 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. ______________________________________________ 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.
