Repost: Examples of "classwt", "strata", and "sampsize" in randomForest?

Sorry for the repost, but I've really been looking, and can't find any
syntax direction on this issue...

Just browsing the documentation, and searching the list came up short... I
have some unbalanced data and was wondering if, in a "0" v "1"
classification forest, some combo of these options might yield better
predictions when the proportion of one class is low (less than 10% in a
sample of 2,000 observations).

Not sure how to specify these terms... from the docs, we have:

classwt: Priors of the classes. Need not add up to one. Ignored for
regression.

So is this something like "... classwt=c(.90,.10)" ? I didn't see the syntax
demonstrated. Similar for "strata" and "sampsize" though there is a default
for sampsize that makes sense... not sure how you would make "a vector of
the length the number of strata", however....

Pointers?

--
---------------------------------------
David L. Van Brunt, Ph.D.
mailto:dlvanbrunt at gmail.com

--
---------------------------------------
David L. Van Brunt, Ph.D.
mailto:dlvanbrunt at gmail.com

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