[R] randomForest: help with combine() function

[Liaw, Andy]

combine() is meant to be used on randomForest objects that were built
from identical training data.

Andy

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Dennis Duro
> Sent: Friday, December 10, 2010 11:59 PM
> To: r-help at r-project.org
> Subject: [R] randomForest: help with combine() function
> 
> I've built two RF objects (RF1 and RF2) and have tried to combine
> them, but I get the following error:
> 
> Error in rf$votes + ifelse(is.na(rflist[[i]]$votes), 0, 
> rflist[[i]]$votes) :
>   non-conformable arrays
> In addition: Warning message:
> In rf$oob.times + rflist[[i]]$oob.times :
>   longer object length is not a multiple of shorter object length
> 
> 
> Both RF models use the same variables, although the NAs in both models
> likely differ (using na.roughfix in both models). I assume this is
> part of the reason that my arrays are "non-conformable". If so, does
> anyone have any suggestions on how to combine in such a situation? How
> similar do RFs have to be in order to combine?
> 
> Cheers
> 
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