Alex Karner <aakarner <at> ucdavis.edu> writes: > I'm trying to (1) plot loess lines for each of my groupings using the same > color for each group; (2) plot loess predicted values. > > The first part is easy:
.. Example removed... Thanks, it was a good example of what you wanted! > My question is, how do I plot predicted values from loess to extend the > lines beyond the range of x? Let's say I want all lines to stop at x = 15. loess is "local polynomial regression fitting". It is good to guide your eyes through confusing data points, but not at all suitable for extrapolation (that's why it is good locally). I would say, it is not even good for interpolation, but that a matter of discussion. I doubt that an extrapolation of a factor 2 beyond the initial range is possible at all without a VERY good model of your data. But in each case, you need a model, for example from earlier longer records. How does the poor function know that your data do not bend down logistic-like after you last value? Dieter ______________________________________________ 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.
