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Repost: Examples of "classwt", "strata", and "sampsize" in randomForest?
3 messages · Gabor Grothendieck, David L. Van Brunt, Ph.D.
See http://finzi.psych.upenn.edu/R/Rhelp02a/archive/40898.html
On 10/27/05, David L. Van Brunt, Ph.D. <dlvanbrunt at gmail.com> wrote:
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?
--
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David L. Van Brunt, Ph.D.
mailto:dlvanbrunt at gmail.com
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David L. Van Brunt, Ph.D.
mailto:dlvanbrunt at gmail.com
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