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
On Thu, 9 Feb 2006, Stefano Sofia wrote:> Dear R-users, > I am using R version 1.8.0-1 under Suse 8.2.That is *really* old.> 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?library(MASS), I presume. -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
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
On 9 Feb 2006 at 11:51, Stefano Sofia wrote:
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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> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
Petr Pikal
petr.pikal at precheza.cz
Paulo, thank you for the straightforward hint. But then, I should use the Box-Cox transformation to a set of data, whose class at the moment is data.frame. The help says only lm and aov objects can be handled. What should I do? thank you Stefano On Thu, 2006-02-09 at 10:56 -0200, Paulo Justiniano Ribeiro Jr wrote:> first load the package with: > > require(MASS) > > and then use the boxcox() function > > > On Thu, 9 Feb 2006, Stefano Sofia wrote: > > > Date: Thu, 09 Feb 2006 11:51:02 +0000 > > From: Stefano Sofia <stefano.sofia at regione.marche.it> > > To: r-help at stat.math.ethz.ch > > 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 > > > > ______________________________________________ > > R-help at stat.math.ethz.ch mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > > > > > > Paulo Justiniano Ribeiro Jr > LEG (Laborat伱伋rio de Estat伱伃stica e Geoinforma伱仹伱仯o) > Departamento de Estat伱伃stica > Universidade Federal do Paran伱仭 > Caixa Postal 19.081 > CEP 81.531-990 > Curitiba, PR - Brasil > Tel: (+55) 41 3361 3573 > Fax: (+55) 41 3361 3141 > e-mail: paulojus at est.ufpr.br > http://www.est.ufpr.br/~paulojus