You must use randomForest with keep.forest=TRUE - otherwise the Forest object is not saved and so no prediction can be made.
--- On Mon, 16/6/08, Jim_S <[EMAIL PROTECTED]> wrote: > From: Jim_S <[EMAIL PROTECTED]> > Subject: [R] randomForest, 'No forest component...' error while calling > Predict() > To: r-help@r-project.org > Received: Monday, 16 June, 2008, 8:13 AM > Dear R-users, > > While making a prediction using the randomForest function > (package > randomForest) I'm getting the following error message: > > "Error in predict.randomForest(model, newdata = CV) : > No forest component > in the object" > Here's my complete code. For reproducing this task, > please find my 2 data > sets attached ( > http://www.nabble.com/file/p17855119/data.rar data.rar ). > > Thanks in advance for any help! > > - Jim > > CT <- > read.table("CT.txt",header=TRUE,sep="\t") > CV <- > read.table("CV.txt",header=TRUE,sep="\t") > # Both CT & CV have the syntaxis X1, X2,...,X97,Y where > all variables are > numeric > x <- CT[,-98] > y <- CT[,98] > xtest <- CV[,-98] > ytest <- CV[,98] > library(randomForest) > model <- randomForest(x ,y , xtest, > ytest,ntree=500,mtry=32,nodesize=5,nPerm=2) > model > > #Call: > # randomForest(x = x, y = y, xtest = xtest, ytest = ytest, > ntree = 500, > mtry = 32, nodesize = 5, > # nPerm = 2) > # Type of random forest: regression > # Number of trees: 500 > #No. of variables tried at each split: 32 > # > # Mean of squared residuals: 0.0022117 > # % Var explained: -1.01 > # Test set MSE: 0 > # % Var explained: 2.61 > > > prediction <- predict(model, newdata= CT) > #Error in predict.randomForest(model, newdata = CV) : > # No forest component in the object > # > -- > View this message in context: > http://www.nabble.com/randomForest%2C-%27No-forest-component...%27-error-while-calling-Predict%28%29-tp17855119p17855119.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, > reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.