Christian -- You don't provide enough information (like a call) to answer this. I suspect, though, that you may be subsetting in a way that passes randomForest no data.
I'm not aware offhand of an easy way to get this error from randomForest. I tried creating some data superficially similar to yours to see whether something would break if there were only a single value in the variable to be explained, but everything worked fine (though it does give a reasonable warning). > test.dat <- data.frame(a = rep(0, 1000), b = runif(1000), c = sample(0:1, 1000, replace = TRUE, p = c(.8, .2)) > t8 <- randomForest(a ~ b + c, data = test.dat) Warning message: The response has five or fewer unique values. Are you sure you want to do regression? in: randomForest.default(m, y, ...) > test.dat[sample(1:1000, 100),"a"] <- runif(100, 1, 200) > t8 <- randomForest(a ~ b + c, data = test.dat) Some other generated data might come up with the error, but I'd bet on the subsetting problem. Hope this helps, -Matt Matthew Wiener RY84-202 Applied Computer Science & Mathematics Dept. Merck Research Labs 126 E. Lincoln Ave. Rahway, NJ 07065 732-594-5303 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Christian Schulz Sent: Wednesday, December 03, 2003 9:42 AM To: [EMAIL PROTECTED] Subject: [R] Error in randomForest.default(m, y, ...) : negative length vectors are not allowed Hi, what i'm doing wrong? I'm using a data.frame with ~ 90.000 instances and 7 attributes, 5 are binary recoded 1 independend variable are a real one and the target is a real one,too. The distributions are not very skewed in the dummy variables ,but in the real variables are ~ 60.000 zero values instances, but zero means no money is payed and is a important value! Many thanks for help & suggestions, regards,christian ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help