But note that converting it e.g. via as.numeric() would be disastrous: > as.numeric(factor(c(3,5,7))) [1] 1 2 3
The OP may need to do some homework with R tutorials to learn about basic R data structures; or if he has already done this, he may need to be more explicit about how the data were created/entered. -- Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Sat, Feb 24, 2018 at 11:21 AM, José María Mateos <ch...@rinzewind.org> wrote: > On Sat, Feb 24, 2018 at 01:16:27PM -0600, Gary Black wrote: > > Hi All, > > > > I'm a newbie and have two questions. Please pardon me if they are very > basic. > > > > > > 1. I'm using a regression tree to predict the selling prices of 10 new > records (homes). The following code is resulting in an error message: > pred <- predict(model, newdata = outOfSample[, -6]) > > > > The error message is: > > > > Error in model.frame.default(Terms, newdata, na.action = na.action, xlev > = attr(object, : > > factor Sq. Feet has new levels 1375, 1421, 1547, 1621, 1868, 2211, 2265, > 2530, 2672, 3365 > > > > Seems to me that variable 'Sq. Feet' is being encoded as a factor > instead of having numerical values. When you train, the model sees a > series of values that understands as categorical, and when you try to > predict it is encountering some different categories and it doesn't know > what to do with them. > > As that variable is most probably numeric, it should be read as such. > You can try converting it on both your train and test datasets. > > Cheers, > > JMM. > > -- José María Mateos > https://rinzewind.org/blog-es || https://rinzewind.org/blog-en > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
