[R] using rpart with a tree misclassification condition
Hello I want to build a classification tree for a binary response variable while the condition for the final tree should be : The total misclassification for each group (zero or one) will be less then 10% . for example: if I have in the root 100 observations, 90 from group 0 and 10 from group 1, I want that in the final tree a maximum of 9 and 1 observations out of group 0 and 1, respectively, will be misclassified. Does anyone know what code will be appropriate for implementing this condition? Thank you in advance Meytar -- View this message in context: http://r.789695.n4.nabble.com/using-rpart-with-a-tree-misclassification-condition-tp3053167p3053167.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] __ 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.
Re: [R] using rpart with a tree misclassification condition
On 22.11.2010 08:32, meytar wrote: Hello I want to build a classification tree for a binary response variable while the condition for the final tree should be : The total misclassification for each group (zero or one) will be less then 10% . for example: if I have in the root 100 observations, 90 from group 0 and 10 from group 1, I want that in the final tree a maximum of 9 and 1 observations out of group 0 and 1, respectively, will be misclassified. Does anyone know what code will be appropriate for implementing this condition? If you mean the misclassification for new observations: no, otherwise I would be extremely rich. If you meant the apparent error rate: Just grow a full tree and then prune step by step until the error is too large for your condition. Then just take the tree model from one step before Uwe Ligges Thank you in advance Meytar __ 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.
Re: [R] using rpart with a tree misclassification condition
Thank you for your prompt reply! Yes, I meant the apparent error rate. According to your advice, if I use rpart to build a full tree, what pruning command will be appropriate and will able me to add as an input to the pruning procedure the total error rate i'm looking for? Thank you very much Meytar -- View this message in context: http://r.789695.n4.nabble.com/using-rpart-with-a-tree-misclassification-condition-tp3053167p3053230.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] __ 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.
