about Cox-Box transformation

Hi

1. 	upgrade
2.	read Introduction to R shipped with the distribution
3.	read documentation to MASS
4.	packages not libraries
5.	use library(MASS) to make functions from MASS package available
6. 	now you can use boxcox() but not on vectors AFAIK

probably not completely correct but this

box.cox <- function(x, lambda,inv=F)
{	if (!inv)
		{if(missing(lambda))
			log(x)
		else (x^lambda - 1)/lambda}
	else (lambda*x+1)^(1/lambda)
}

you can use to perform Box-Cox transformation on vectors.

HTH
Petr

From:           	Stefano Sofia <stefano.sofia at regione.marche.it>
To:             	r-help at stat.math.ethz.ch
Date sent:      	Thu, 09 Feb 2006 11:51:02 +0000
Subject:        	[R] about Cox-Box transformation

Dear R-users,
I am using R version 1.8.0-1 under Suse 8.2. 
I need to use the boxcox command because I want to apply a Cox-Box
transformation to a vector of rainfall values. Within the libraries,
the MASS library is present, but I don't know whether this means that
is automatically installed or not. The command doesn't work. What do I
have to do in order to make it working? Is just a problem of
installation or simply of recalling the right command?

thank you for your help
Stefano

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Petr Pikal
petr.pikal at precheza.cz