Re: [R] What are the red line and cut line in lm's Residuals vs Fitted plot?
> Do you mean that the red line is a regression line? > Why is the regression (line) weighted? I suggest you look up 'locally weighted regression' to find out why that is useful and what it is for. *** This email and any attachments are confidential. Any use...{{dropped:8}} __ 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.
Re: [R] What are the red line and cut line in lm's Residuals vs Fitted plot?
Do you mean that the red line is a regression line? Why is the regression (line) weighted? On 2016-09-19 14:41, S Ellison wrote: What are the red line and cut line in lm's Residuals vs Fitted plot? The dotted line is at 0 and the red line is a locally weighted regression calculated using lowess and plotted using panel.smooth. See ?panel.smooth and ?lowess for details The main clue to this is in the arguments to ?plot.lm, which uses panel.smooth as a panel function. S Ellison *** This email and any attachments are confidential. Any u...{{dropped:8}} __ 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.
Re: [R] What are the red line and cut line in lm's Residuals vs Fitted plot?
> What are the red line and cut line in lm's Residuals vs Fitted plot? The dotted line is at 0 and the red line is a locally weighted regression calculated using lowess and plotted using panel.smooth. See ?panel.smooth and ?lowess for details The main clue to this is in the arguments to ?plot.lm, which uses panel.smooth as a panel function. S Ellison *** This email and any attachments are confidential. Any use...{{dropped:8}} __ 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.
Re: [R] What are the red line and cut line in lm's Residuals vs Fitted plot?
> On Sep 18, 2016, at 7:25 AM, mviljamaa wrote: > > What are the red line and cut line in lm's Residuals vs Fitted plot? > > As seen in e.g.: > > http://i.imgur.com/QvZ6oeT.png R has a `plot.lm` function that is invoked by `plot(lm_object)` when `lm_object` has a class of "lm". It produces multiple diagnostic plots. The default is for display of 4 of the possible 6 plots. The help page can be specifically accessed by: ?plot.lm And run the first example: lm.SR <- lm(sr ~ pop15 + pop75 + dpi + ddpi, data = LifeCycleSavings) plot(lm.SR) If you have further question about that particular plot, which would be the first one, you should first review the help page and then review the code seen with: plot.lm #Error: object 'plot.lm' not found getAnywhere(plot.lm) # the way to see code that is not exported: See: function (x, which = c(1L:3L, 5L), caption = list("Residuals vs Fitted", "Normal Q-Q", "Scale-Location", "Cook's distance", "Residuals vs Leverage", expression("Cook's dist vs Leverage " * h[ii]/(1 - h[ii]))), panel = if (add.smooth) panel.smooth else points, sub.caption = NULL, main = "", ask = prod(par("mfcol")) < length(which) && dev.interactive(), ..., id.n = 3, labels.id = names(residuals(x)), cex.id = 0.75, qqline = TRUE, cook.levels = c(0.5, 1), add.smooth = getOption("add.smooth"), label.pos = c(4, 2), cex.caption = 1, cex.oma.main = 1.25) Note: I checked the option setting with: > getOption("add.smooth") [1] TRUE ---snipped plotting set up logic - if (show[1L]) { ylim <- range(r, na.rm = TRUE) if (id.n > 0) ylim <- extendrange(r = ylim, f = 0.08) dev.hold() plot(yh, r, xlab = l.fit, ylab = "Residuals", main = main, ylim = ylim, type = "n", ...) panel(yh, r, ...) # this is what is drawing the "red line" if (one.fig) title(sub = sub.caption, ...) mtext(getCaption(1), 3, 0.25, cex = cex.caption) if (id.n > 0) { y.id <- r[show.r] y.id[y.id < 0] <- y.id[y.id < 0] - strheight(" ")/3 text.id(yh[show.r], y.id, show.r) } abline(h = 0, lty = 3, col = "gray") # this is drawing the dotted line dev.flush() So the `panel` function is creating the "red line" and its help page is at: ?panel.smooth #... ... since the `panel funciton was given that value. -- David. > > __ > 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. David Winsemius Alameda, CA, USA __ 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] What are the red line and cut line in lm's Residuals vs Fitted plot?
What are the red line and cut line in lm's Residuals vs Fitted plot? As seen in e.g.: http://i.imgur.com/QvZ6oeT.png __ 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.