3 messages · Dimitri Liakhovitski, Liaw, Andy, Max Kuhn
Hello! I know that as trees are constructed, the root node contains a bootstrap sample of data of the same size as original the data set. Would you please confirm that it is a bootstrap sample with replacement? I think it is - just wanted to make sure. Thank you very much!
Dimitri Liakhovitski Ninah.com
See the "replace" argument in ?randomForest. Andy
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Dimitri Liakhovitski Sent: Friday, May 07, 2010 12:21 PM To: r-help Subject: [R] randomForest: sampling with replacement? Hello! I know that as trees are constructed, the root node contains a bootstrap sample of data of the same size as original the data set. Would you please confirm that it is a bootstrap sample with replacement? I think it is - just wanted to make sure. Thank you very much! -- Dimitri Liakhovitski Ninah.com
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Would you please confirm that it is a bootstrap sample with replacement?
Someone should note that the definition of a bootstrap sample is a sample with replacement (usually of size n). I've read quite a few papers where they claim to be using the bootstrap. Upon further review (sometimes to the code) they often are doing permutation testing-type randomization. This is mostly in biological journals. There are also at least paper that describe the "out of box" random forests error rate... Max