[R] normal score transform

[Ulrich Leopold]

How would I do a backtransform of predicted values (derived from the given
data) AND the variance?

Ulrich

Liaw, Andy wrote:
 > The "normal scores" are just ranks of the data mapped onto the normal CDF,
 > so something like:
 >
 > qnorm((rank(x) - 0.375)/(sum(!is.na(x)) + .25))
 >
 > should do what you want.  Another alternative (as calculated in qqnorm) is
 >
 > qnorm(ppoints(x))
 >
 > Andy
 >
 >
 >>-----Original Message-----
 >>From: Ulrich Leopold [mailto:uleopold at science.uva.nl]
 >>Sent: Thursday, September 12, 2002 12:59 PM
 >>To: r-help at stat.math.ethz.ch
 >>Subject: [R] normal score transform
 >>
 >>
 >>Dear list,
 >>
 >>could someone point me to the normal score transform and it's
 >>use in R?
 >>
 >>I would like to transform my data with normal score
 >>transform, do some
 >>geostatsitical predictions and would like to transform the
 >>estimated values
 >>back including the estimation variance.
 >>
 >>Any suggestions?
 >>
 >>Ulrich
 >>--
 >>__________________________________________________
 >>
 >>Ulrich Leopold MSc.
 >>
 >>Department of Physical Geography
 >>Institute for Biodiversity and Ecosystem Dynamics
 >>Faculty of Science
 >>University of Amsterdam
 >>Nieuwe Achtergracht 166
 >>NL-1018WV Amsterdam
 >>
 >>Phone: +31-(0)20-525-7456 (7451 Secretary)
 >>Fax:   +31-(0)20-525-7431
 >>Email: uleopold at science.uva.nl
 >>http://www.frw.uva.nl/soil/Welcome.html
 >>
 >>Check us also out at:
 >>Netherlands Centre for Geo-ecological Research
 >>http://www.frw.uva.nl/icg
 >>
 >>
 >>
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 >
 >
 >
 > 
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-- 
__________________________________________________

Ulrich Leopold MSc.

Department of Physical Geography
Institute for Biodiversity and Ecosystem Dynamics
Faculty of Science
University of Amsterdam
Nieuwe Achtergracht 166
NL-1018WV Amsterdam

Phone: +31-(0)20-525-7456 (7451 Secretary)
Fax:   +31-(0)20-525-7431
Email: uleopold at science.uva.nl
http://www.frw.uva.nl/soil/Welcome.html

Check us also out at:
Netherlands Centre for Geo-ecological Research
http://www.frw.uva.nl/icg




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