Hi all, Had struggled in getting "Strata" in randomForest to work on this.
Can I get randomForest for each of its TREE, to get ALL sample from some strata to build tree, while leaving some strata TOTALLY untouched as oob? e.g. in below, how I can tell RF to, - for tree 1 in the forest, to use only Site A and B to build the tree, while using the WHOLE Site C data for the oob error rate, - for tree 2, use only site A and C to build tree, while using whole site B data for oob - for tree 3, use Site B and C, A as oob...? My command does not work as it would use some sample in all of the sites: rforest.obj <- randomForest(Presence.f ~., data=dataset.subset, strata = site.factor) while the setting the corresponding "sampsize" argument seems would only screen out the Site in all tree building... Site Presence Length Sulphur A Yes 3.50 19.42 A No 3.90 51.09 A No 3.60 26.75 B Yes 2.60 9.71 B No 2.20 9.77 B No 2.60 8.60 B No 3.00 35.59 C Yes 3.50 16.07 C No 3.40 49.96 C No 3.10 35.35 Any idea / comments are welcomed. Thanks in advance. Coll -- View this message in context: http://r.789695.n4.nabble.com/Random-Forest-Strata-tp2295731p2295731.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.
