I was about to reply to the item with a similar msg as Bert, but then realized that the students were pointing out that the function (possibly less than perfectly documented -- I didn't check) only works for complete years. I've encountered that issue myself when teaching forecasting. So I was prepared to accept the item more as a feature request or at least a documentation request.
It would, of course, be useful for both homework and research use to have a function able to do partial year forecasts, and I suspect there is that capability in R somewhere. I've built custom scripts for that, but more than a decade and a half ago. It takes time and care. JN On 2019-04-03 3:57 p.m., Bert Gunter wrote: > This list has *no homework* policy. I would assume that the purpose of your > "project" is for you to learn how to deal with exactly the sorts of issues > you describe. > > (But you might get lucky with a response anyway). > > 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 Wed, Apr 3, 2019 at 12:48 PM Michaela Berndl <michib...@gmail.com> wrote: > >> Dear Sir or Madam, >> >> >> >> we are statistic students at the Johannes Kepler University in Linz, >> Austria. >> >> In a project we had to analyse the time series influenza from the package >> tscount and make a prediction for one year. For the prediction we used the >> function predict from the package raster. >> >> Since our data ends not at the end of a year, but at week 23 in the year >> 2012, we need to predict till the 23th week of 2013. >> >> >> >> As identified in the Figure (boxplot of the original data) attached, in the >> first months of >> >> every year the recorded cases were always higher than in the rest of the >> year. >> >> The other figure shows the prediction with three models (the 3 colored >> lines) from week 23 in the year 2012 to week 22 in the year 2013 and the >> original data (the black line) for the same time. Due to the fact that the >> the peaks of the prediction lines are not even close to the original data, >> we are not sure whether the predict function is correct. We suspect that >> the predict function just works for a prediction of exactly one year, which >> starts at week 1 and ends at week 52. >> >> >> >> >> >> Kind regards, >> Doris Kuttner, Michaela Berndl >> ______________________________________________ >> 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. > ______________________________________________ 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.