R help - Jun 2003 - Haw I get best lambda in box-cox

Hi all,

Does anyone know of a function that return the best lambda in box-cox
transformation?

many thanks for any help.


-- 
Cristiane S. Rocha
Laboratorio Genoma Funcional - Bioinform?tica
Centro de Biologia Molecular e Engenharia Genetica
Universidade Estadual de Campinas
Campinas - SP - Brasil
Tel:(19)3788-1119

1.  Look up boxcox() in the package "MASS".

2.  Assume "bc" is an object returned by boxcox(...), you can do

  with(bc, x[which.max(y)])

    to find the best lambda.

HTH,
Andy
> -----Original Message-----
> From: crirocha at unicamp.br [mailto:crirocha at unicamp.br] 
> Sent: Tuesday, June 24, 2003 10:22 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Haw I get best lambda in box-cox
> 
> 
> 
> Hi all,
> 
> Does anyone know of a function that return the best lambda in 
> box-cox transformation?
> 
> many thanks for any help.
> 
> 
> -- 
> Cristiane S. Rocha
> Laboratorio Genoma Funcional - Bioinform?tica
> Centro de Biologia Molecular e Engenharia Genetica
> Universidade Estadual de Campinas
> Campinas - SP - Brasil
> Tel:(19)3788-1119
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list 
> https://www.stat.math.ethz.ch/mailman/listinfo> /r-help
> 
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"boxcox" in library(MASS).  I found it just now via
"www.r-project.org"
-> search -> "R Site Search" and via the index in Venables and
Riply
(2002) Modern Applied Statistics with S, 4th ed. (Springer).  The latter 
(p. 171-172) described how to make the corresponding profile likelihood 
plot using their function "logtrans".

hth.  spencer graves

crirocha at unicamp.br wrote:
> Hi all,
> 
> Does anyone know of a function that return the best lambda in box-cox
> transformation?
> 
> many thanks for any help.
> 
>