On 05/18/2010 10:41 PM, Greg Snow wrote:
Have you read the BoxCox paper? It has the theory in there for dealing with an
offset parameter (though I don't know of any existing functions that help in
estimating both lambdas at the same time). Though another important point (in
the paper as well
half Of Holger Steinmetz
> Sent: Sunday, May 16, 2010 6:22 AM
> To: r-help@r-project.org
> Subject: [R] Box-Cox Transformation: Drastic differences when varying
> added constants
>
>
> Dear experts,
>
> I tried to learn about Box-Cox-transformation but found the following
&
Hi Holger,
I would also highly recommend you look at the ?boxcox and ?logtrans
functions in the MASS package. There is also a very illuminating,
concise discussion about their use on Pages 170 - 172 of
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics
with S. Fourth edition.
with
On 2010-05-16 6:22, Holger Steinmetz wrote:
Dear experts,
I tried to learn about Box-Cox-transformation but found the following thing:
When I had to add a constant to make all values of the original variable
positive, I found that
the lambda estimates (box.cox.powers-function) differed dramati
Dear experts,
I tried to learn about Box-Cox-transformation but found the following thing:
When I had to add a constant to make all values of the original variable
positive, I found that
the lambda estimates (box.cox.powers-function) differed dramatically
depending on the specific constant chos
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