[R] mob(party) formula question

[Birgitle]

Thanks again.
Unfortunately I have always this missing values problem.
But the missings have also a meaning and its impossible to code it
differently or impute.

Also thanks for the explanation. Now I understand.

B.


Achim Zeileis wrote:
> 
> On Wed, 13 Aug 2008, Birgitle wrote:
> 
>> Many thanks for your answer and the code that you offered me.
>>
>> I get this error message after calling mob (look at my given example).
>> I guess it has something to do with the missings?
> 
> Yes, you have to handle NAs in advance if you want to fit that model. 
> We'll try to fix that in future versions.
> 
>> The iris example works also fine for me.
>>
>> Sorry that I am not enough into statistics to really understand the
>> following:
>>
>>
>> Achim Zeileis wrote:
>>>
>>>
>>> .....
>>> For the variables for which a linear specification makes sense (at least
>>> in each component) then you should include them for modeling. And those
>>> variables for which it is not clear a priori what a useful parametric
>>> specification would be should be used as partitioning variables.
>>> ...
>>>
>>>
>>
>> What do you mean with "linear specification"? I would be very happy if
>> you
>> could explain.
> 
> Well, in each node you fit a logistic regression model. This is a 
> (generalized) linear model, hence the variables included have a linear 
> influence (on the link scale) within each node. The partitioning variables 
> on the other hand capture step-shaped influences (if they are selected by 
> the algorithm). See the references on ?mob for further details.
> 
> Best,
> Z
> 
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> 


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