[R] mob(party) formula question

Birgitle birgit.lemcke at systbot.uzh.ch
Wed Aug 13 17:00:58 CEST 2008

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.


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
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

The art of living is more like wrestling than dancing.
(Marcus Aurelius)
View this message in context: http://www.nabble.com/mob%28party%29-formula-question-tp18959898p18964864.html
Sent from the R help mailing list archive at Nabble.com.

More information about the R-help mailing list