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RWeka prediction
3 messages · Dajiang Liu, Achim Zeileis
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On Sun, 26 Apr 2009, Dajiang Liu wrote:
Dear All,I encountered a problem when I use RWeka for prediction. Specifically, I use the following: res=J48(X1~.,data=mydata); predict(res), #it worked fine but when I tried to use a different data set, i.e. predict(res,newdata=mynewdata); all the predictions I get is 0, which apparently is problematic. What is weird is, if I use the old data, but use the newdata option, i.e. predict(res,newdata=mydata), all prediction is 0; Can anyone hint me what is wrong?
No, because you do not provide sufficient information (as requested by the
posting guide pointed to below). For me, this works fine:
library("RWeka")
ldat <- iris[1:140,]
tdat <- iris[-(1:140),]
m <- J48(Species ~ ., data = ldat)
predict(m, newdata = tdat)
Thanks a lot. Regards, Dajiang [[alternative HTML version deleted]]
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