search for: mattjamesfr

Displaying 2 results from an estimated 2 matches for "mattjamesfr".

2011 Nov 26
3
Question about randomForest
I've been using the R package randomForest but there is an aspect I cannot work out the meaning of. After calling the randomForest function, the returned object contains an element called prediction, which is the prediction obtained using all the trees (at least that's my understanding). I've checked that this prediction set has the error rate as reported by err.rate. However, if I
2012 Apr 13
1
caret package: custom summary function in trainControl doesn't work with oob?
Hi all, I've been using a custom summary function to optimise regression model methods using the caret package. This has worked smoothly. I've been using the default bootstrapping resampling method. For bagging models (specifically randomForest in this case) caret can, in theory, uses the out-of-bag (oob) error estimate from the model instead of resampling, which (in theory) is largely