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hi I got the following error in 'evtree'. could u help pl. Error in if (var(mf[, nVariables]) <= 0) stop("variance of the denpendent variable is 0") : argument is of length zero [[alternative HTML version deleted]]

How about: x <- data.frame(matrix(rnorm(1550),c(50,31))) model <- step(lm(x[,1] ~ as.matrix(x[,2:31]))) --Matt -----Original Message----- From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of rongguiwong Sent: Monday, September 20, 2004 20:52 PM To: r-help at stat.math.ethz.ch Subject: [R] how to take this experiment with R? This message uses