Displaying 7 results from an estimated 7 matches for "aziendali".
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aziendale
2009 May 21
1
Rpart - best split selection for class method and Gini splitting index
...look to the
source code that works out the best split for un unordered predictor.
Does anyone can suggest me which functions in the sources I should consider
?
Any input would be highly appreciated.
Thank you
Paolo
Paolo Radaelli
Dipartimento di Metodi Quantitativi per le Scienze Economiche ed Aziendali
Facolt? di Economia
Universit? degli Studi di Milano-Bicocca
Via Bicocca degli Arcimboldi, 8
20126 Milano
Italy
e-mail paolo.radaelli at unimib.it
Tel +39 02 6448 3163
Fax +39 02 6448 3105
2007 Jan 03
1
User defined split function in Rpart
...;- cumsum(wt)[-n]
right.wt <- sum(wt) - left.wt
lmean <- temp/left.wt
rmean <- -temp/right.wt
goodness <- (left.wt*lmean^2 + right.wt*rmean^2)/sum(wt*y^2)
list(goodness= goodness, direction=sign(lmean))
}
}
Paolo Radaelli
Dipartimento di Metodi Quantitativi per le Scienze Economiche ed Aziendali
Facolt? di Economia
Universit? degli Studi di Milano-Bicocca
P.zza dell'Ateneo Nuovo, 1
20126 Milano
Italy
e-mail paolo.radaelli a unimib.it
2006 Nov 24
1
Splitting criterion in tree and rpart
? stato filtrato un testo allegato il cui set di caratteri non era
indicato...
Nome: non disponibile
Url: https://stat.ethz.ch/pipermail/r-help/attachments/20061124/6ac3d11f/attachment.pl
2009 Jun 04
0
ordered Twoing criterion in classification trees
...#39;m using the rpart package to build classification trees. I'm interested in
implementing the ordered Twoing as a splitting criterion.
Does anyone have experience with this task ?
Thank you for your help
Paolo
Paolo Radaelli
Dipartimento di Metodi Quantitativi per le Scienze Economiche ed Aziendali
Facolt? di Economia
Universit? degli Studi di Milano-Bicocca
Via Bicocca degli Arcimboldi, 8
20126 Milano
Italy
e-mail paolo.radaelli at unimib.it
Tel +39 02 6448 3163
Fax +39 02 6448 3105
2009 May 14
0
Rpart - user defined split functions
...e hard for me to understand which part of the
code I should include in definining my own eval and init functions.
Does anyone can suggest me how to proceed ?
Any input would be highly appreciated.
>
Thank you
Paolo
Paolo Radaelli
Dipartimento di Metodi Quantitativi per le Scienze Economiche ed Aziendali
Facolt? di Economia
Universit? degli Studi di Milano-Bicocca
Via Bicocca degli Arcimboldi, 8
20126 Milano
Italy
e-mail paolo.radaelli at unimib.it
Tel +39 02 6448 3163
Fax +39 02 6448 3105
2009 May 26
0
cross-validation in rpart
...s
computed by averaging the erorrs one gets in predicting the class of a
group of obs by the tree obtained with the others 9 ? xstd is the standard
deviation of this errors ?
Thank you for your help
Paolo Radaelli
Paolo Radaelli
Dipartimento di Metodi Quantitativi per le Scienze Economiche ed Aziendali
Facolt? di Economia
Universit? degli Studi di Milano-Bicocca
Via Bicocca degli Arcimboldi, 8
20126 Milano
Italy
e-mail paolo.radaelli at unimib.it
Tel +39 02 6448 3163
Fax +39 02 6448 3105
begin included message
a.. begin included message I'm having a problem with custom functions in
rpart...
2009 Jun 09
3
rpart - the xval argument in rpart.control and in xpred.rpart
...performed. Am I right ? If so, how many subsets compose the learning
sample when performing one of the xval cross-validations ? Is it a 10-fold
cross-validation repeated xval=10 times ?
Thank you for your help
Paolo
Paolo Radaelli
Dipartimento di Metodi Quantitativi per le Scienze Economiche ed Aziendali
Facolt? di Economia
Universit? degli Studi di Milano-Bicocca
Via Bicocca degli Arcimboldi, 8
20126 Milano
Italy
e-mail paolo.radaelli at unimib.it
Tel +39 02 6448 3163
Fax +39 02 6448 3105