[R] RandomForest-question about split point and GetTree function

2016-05-06 Thread Adam Sanders
I am looking at results of a random forest. In the documentation, it says the following for categorical variables: "For categorical predictors, the splitting point is represented by an integer, whose binary expansion gives the identities of the categories that goes to left or right. For example, i

Re: [R] randomForest question--problem with ntree

2009-08-14 Thread Michael Knudsen
On Fri, Aug 14, 2009 at 1:43 PM, Mary Putt wrote: > I'm not calling it a problem that the answer converges--i.e. that the > algorithm is stable. but if you look at the example even though I've asked > for 2000 or 200 tress, ntree=2000 or ntree=200, it still gives me 500 trees > according to the

Re: [R] randomForest question--problem with ntree

2009-08-14 Thread Michael Knudsen
On Thu, Aug 13, 2009 at 11:11 PM, Mary Putt wrote: Hi Mary, > I would like to use a random Forest model to get an idea about which > variables from a dataset may have some prognostic significance in a smallish > study. The default for the number of trees seems to be 500. I tried changing > the

[R] randomForest question--problem with ntree

2009-08-13 Thread Mary Putt
Hi, I would like to use a random Forest model to get an idea about which variables from a dataset may have some prognostic significance in a smallish study. The default for the number of trees seems to be 500. I tried changing the default to ntree=2000 or ntree=200 and the results appear ident

[R] randomForest() question

2007-11-21 Thread Peter Tait
Hi, I am trying to find some information on the strata option in randomForest(). I am hoping to make predictions from some clustered data (many predictors measured repeatedly on the same subject over time). I would like to apply random forests or gradient boosting ( gbm() ) to this problem but