R help - Dec 2008 - Getting Odds ratios for tree branches-CART model

Dear all,


> I have been using rpart to get trees. May someone help me with how I can do
> some logistic regression modelling to derive odds ratios on the branches.
> Also help on how to derive estimates on prediction error.
>
> --
> Kind Regards,
>
> Jestinah
>
>
>
> Home Address:
> Brusselsepoortstraat 85
> 9000
> Gent
> Belgium
>


-- 
Kind Regards,

Jestinah



Home Address:
Brusselsepoortstraat 85
9000
Gent
Belgium

	[[alternative HTML version deleted]]

jestinah mahachie wrote:
> Dear all,
> 
> 
> 
>> I have been using rpart to get trees. May someone help me with how I
can do
>> some logistic regression modelling to derive odds ratios on the
branches.
>> Also help on how to derive estimates on prediction error.
>>
>> --
>> Kind Regards,
>>
>> Jestinah
The odds ratios from rpart will be badly biased away from 1.0. 
Unbiasing them will be tricky.

Frank
>>
>>
>>
>> Home Address:
>> Brusselsepoortstraat 85
>> 9000
>> Gent
>> Belgium
>>
> 
> 
> 

-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University