Re: [R] predict.lm, matrix in formula and newdata

2010-08-17 Thread William Dunlap
> -Original Message- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Stephan Kolassa > Sent: Tuesday, August 17, 2010 5:25 AM > To: R-help@r-project.org > Subject: [R] predict.lm, matrix in formula and newdata > > Dear a

Re: [R] predict.lm, matrix in formula and newdata

2010-08-17 Thread Charles Roosen
Of Stephan Kolassa Sent: 17 August 2010 14:25 To: R-help@r-project.org Subject: [R] predict.lm, matrix in formula and newdata Dear all, I am stumped at what should be a painfully easy task: predicting from an lm object. A toy example would be this: XX <- matrix(runif(8),ncol=2) yy <- runif(4

Re: [R] predict.lm, matrix in formula and newdata

2010-08-17 Thread Dimitris Rizopoulos
try it better this way: XX <- matrix(runif(8), ncol = 2) DF <- as.data.frame(XX) DF$yy <- runif(4) model <- lm(yy ~ ., DF) XX.pred <- as.data.frame(matrix(runif(6), ncol = 2)) predict(model, XX.pred) I hope it helps. Best, Dimitris On 8/17/2010 2:24 PM, Stephan Kolassa wrote: Dear all, I

[R] predict.lm, matrix in formula and newdata

2010-08-17 Thread Stephan Kolassa
Dear all, I am stumped at what should be a painfully easy task: predicting from an lm object. A toy example would be this: XX <- matrix(runif(8),ncol=2) yy <- runif(4) model <- lm(yy~XX) XX.pred <- data.frame(matrix(runif(6),ncol=2)) colnames(XX.pred) <- c("XX1","XX2") predict(model,newdata=XX.p