On Nov 1, 2013, at 6:50 AM, Ryan wrote: > Good day all. > > I am hoping you can help me (and I did this right). I've been working in R > for a week now, and have encountered a problem with forecast.lm(). > > I have a list of 12 variables, all type = double, with 15 data entries. > (I imported them from tab delimited text files, and then formatted as.numeric > to change from list to double) > (I understand that this leaves me rather limited in my degrees of freedom, > but working with what I have, sadly. ) > > I have a LM model, such that > REGGY = lm(formula=Y~A,B,C,...,I,J)
This looks wrong. Separating independent predictors with commas would be highly unusual. > which I am happy with. > > I have > NEWDATA = data.frame(A+B+C+D....+I+J) This also looks wrong. Separating arguments to data.frame with "+"-signs is surely wrong. > > When i try to run > > forecast.lm(REGGY, h=5) > > i receive the following error > "Error in as.data.frame(newdata) : > argument "newdata" is missing, with no default" If your code prior to calling forecast on the REGGY-object was really what you showed here, I am not surprised. You should post the output of str() on the data-objects that has the 12 variables and if it was modified the data argument pasted to `lm()` when you made REGGY. (Beginners should name their data arguments.) > > When I run > forecast.lm(REGGY, NEWDATA, h=5) > I receive the confidence intervals of the 15 data entries I already possess. > I understand that by including NEWDATA, the "h=5" is ignored, but without > NEWDATA, I receive the error message. > > Can anyone help me please? > > Regards > Ryan > > P.S The forecast is trying to predict the next 5 values for Y from the > regression model pasted above. I'm a bit rusty with regressions, but I think > I've covered my bases as well as I can, and from what I understand of the R > code, I'm following the right steps. Not if what you posted here was your code. I think you missed a few crucials points about R syntax. > -- David Winsemius Alameda, CA, USA ______________________________________________ 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.
