[R] getting probabilities from SVM

From: roger bos <roger.bos_at_gmail.com>
Date: Fri 17 Feb 2006 - 07:39:30 EST

I am using SVM to classify categorical data and I would like the probabilities instead of the classification. ?predict.svm says that its only enabled when you train the model with it enabled, so I did that, but it didn't work. I can't even get it to work with iris. The help file shows that probability = TRUE when training the model, but doesn't show an example. Then I try to predict with probabilities, I still only get classifications back. Anyone get this to work and can help me out?




     # alternatively the traditional interface:
     x <- subset(iris, select = -Species)
     y <- Species
     model <- svm(x, y, probability = TRUE)
     pred <- predict(model, x, probability = TRUE)

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