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Pruning trees in a Random Forest
4 messages · Anirudh Kondaveeti, Wensui Liu, Liaw, Andy
The way the trees are structured in randomForest, there's no way to stop tree growth by depth (what you called level). (If anyone has ideas, I'm all ears.) Andy From: Anirudh Kondaveeti
Hi all! The randomForest in R enables us to prune the trees using the nodesize feature where we can stop splitting a node if it contains less than the specified no.of of records/entities at that node. However is there a way to stop the tree growing after a specified number of levels. To be more clear on what I mean by a level. Level 0 is the parent node, Level 1 has 2 daughter nodes, Level 2 has 4 daughter nodes, Level 3 has 8 daughter nodes etc. Thanks in advance! Anirudh Kondaveeti ---------------------------- [[alternative HTML version deleted]]
______________________________________________ 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.
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I don't think it necessary to prune trees in RF, per brieman's paper.
On 3/20/09, Liaw, Andy <andy_liaw at merck.com> wrote:
The way the trees are structured in randomForest, there's no way to stop tree growth by depth (what you called level). (If anyone has ideas, I'm all ears.) Andy From: Anirudh Kondaveeti
Hi all! The randomForest in R enables us to prune the trees using the nodesize feature where we can stop splitting a node if it contains less than the specified no.of of records/entities at that node. However is there a way to stop the tree growing after a specified number of levels. To be more clear on what I mean by a level. Level 0 is the parent node, Level 1 has 2 daughter nodes, Level 2 has 4 daughter nodes, Level 3 has 8 daughter nodes etc. Thanks in advance! Anirudh Kondaveeti ---------------------------- [[alternative HTML version deleted]]
______________________________________________ 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.
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______________________________________________ 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.
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