search for: poulos

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2006 Jul 21
2
rpart unbalanced data
...s that have only 15 observations, while others have over 100. I have attempted to supply prior weights to the dataset, though this does not improve the classification greatly. Could anyone supply some hints about how to improve a classification for a badly unbalanced datase? Thank you, Helen Mills Poulos
2008 Mar 11
1
randomForest get tree
All, What purpose does the getTree function have in Random Forest? Can you graph it as you can in rpart and can it be interpreted in the same way? Helen Mills Poulos Yale School of Forestry
2008 Apr 04
1
random forest varimp
Friends, I have noticed that many publications that use RF report variable importance as a function of mean decrease in accuracy rather than mean decrease in gini. Am I correct that the mean decrease in accuracy is just the mean decrease in gini divided by 100? Thanks, Helen Mills Poulos Yale School of Forestry
2007 Sep 13
2
Automate Destroying Snapshot''s
I have created a script that gets a snapshot and backs the snapshot to tape. I would like to keep the snapshot around for one week, than destroy it using the following command: "zfs destroy snapshotlvolume." Is there a way to automate the destroying of snapshots that are older that x amount of days? This message and its attachments may contain legally privileged or
2006 Jul 28
0
Non-metric Multidimensional Scaling in R (Tobias Verbeke)
The vegan package has non-metric multidimensional scaling in addition to a variety of other ordination techniques. Regards, Helen Mills Poulos Yale University