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 > > ______________________________________________ > R-help@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. ______________________________________________ R-help@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.
