Hi > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Ryan > Sent: Monday, November 04, 2013 4:19 PM > To: David Winsemius > Cc: r-help@r-project.org > Subject: Re: [R] forecast.lm() and NEWDATA > > Hi David (and everyone) > > Thank you for your reply. > > I see I copied down the code wrong for the regression. I was using the > "+" seperator, and not ",". The regression was working. > > I made a mistake with the NEWDATA, where I also used "+", instead of > ",", however I see both work but return very different results. I have > corrected the mistake. > > However, I am still receiving the same error when I try to run the > forecast.lm. > " > > forecast.lm(REGGY, h=5) > > i receive the following error > "Error in as.data.frame(newdata) : > argument "newdata" is missing, with no default"" >
Where is forecast.lm from? Anyway, it probably requires an argument for newdata so maybe forecast.lm(REGGY, newdata=somedata, h=5) will work. Regards Petr > > > I am sorry to say, I don't understand your reference to the string > output when you mentioned > > " > > 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. > > " > As of right now, NEWDATA includes all the independent variables from > the REGGY Regression. > > > Should the NEWDATA data.frame include the dependent variable? > > Also, is it necessary to reformat all variables as time series? (I have > not currently done so) > > Regards > Ryan > > On 2013-11-01 07:28 PM, David Winsemius wrote: > > 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. > > ______________________________________________ > 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. ______________________________________________ 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.
