Does the stricture against "colour" extend to grayscale? Does it apply to lines as well as text?
John Maindonald email: john.maindon...@anu.edu.au phone : +61 2 (6125)3473 fax : +61 2(6125)5549 Centre for Mathematics & Its Applications, Room 1194, John Dedman Mathematical Sciences Building (Building 27) Australian National University, Canberra ACT 0200. On 19/02/2009, at 5:58 PM, Prof Brian Ripley wrote:
On Wed, 18 Feb 2009, John Fox wrote:Dear John,-----Original Message----- From: John Maindonald [mailto:john.maindon...@anu.edu.au] Sent: February-18-09 4:57 PM To: John Fox Cc: 'Martin Maechler'; r-devel@r-project.orgSubject: Re: [Rd] plot.lm: "Cook's distance" label can overplot pointlabelsDear John - The title above the graph is also redundant for the first of the plots; do we want to be totally consistent? I am not sure.Why not? "A foolish consistency is the hobgoblin of little minds," but maybethis isn't a foolish consistency.It occurs to me that the text "Cook's distance", as well as the contours, might be in red.That would provide a nice visual cue (for those who aren't colour blind).Or using a black-and-white device. We have not hitherto assumed a colour device in 'stats' graphics, and given how often they are printed I don't think we want to start.As so often, it seems that what looks good is in the eye of the beholder. If the two of you can agree on something that you both see is a definite improvement, please provide a patch and examples to try to persuade everyone else. (As a Wishlist item on R-bugs, so it gets recorded.)Best, JohnRegards John. John Maindonald email: john.maindon...@anu.edu.au phone : +61 2 (6125)3473 fax : +61 2(6125)5549 Centre for Mathematics & Its Applications, Room 1194, John Dedman Mathematical Sciences Building (Building 27) Australian National University, Canberra ACT 0200. On 18/02/2009, at 12:27 PM, John Fox wrote:Dear John, It occurs to me that the title above the graph, "Residuals vs. Leverage," isentirely redundant since the x-axis is labelled "Leverage" and the y-axis "Studentized residuals." Why not use the title above the graph for "Cook's distance countours"? Regards, John-----Original Message----- From: r-devel-boun...@r-project.org[mailto:r-devel-boun...@r-project.org]OnBehalf Of John Maindonald Sent: February-17-09 5:54 PM To: r-devel@r-project.org Cc: Martin Maechler Subject: [Rd] plot.lm: "Cook's distance" label can overplot point labels The following code demonstrates an annoyance with plot.lm(): library(DAAGxtras) x11(width=3.75, height=4)nihills.lm <- lm(log(time) ~ log(dist) + log(climb), data = nihills)plot(nihills.lm, which=5) OR try the following xy <- data.frame(x=c(3,1:5), y=c(-2, 1:5)) plot(lm(y ~ x, data=xy), which=5)The "Cook's distance" text overplots the label for the point with thesmallest residual. This is an issue when the size of the plot is much less than the default, and the pointsize is not reduced proportionately. I suggest the following: xx <- hii xx[xx >= 1] <- NA ## Insert new code fracht <- (1.25*par()$cin[2])/par()$pin[2] ylim[1] <- ylim[1] - diff(ylim)*max(0, fracht-0.04) ## End insert new code plot(xx, rsp, xlim = c(0, max(xx, na.rm = TRUE)), ylim = ylim, main = main, xlab = "Leverage", ylab = ylab5, type = "n", ...) Then, about 15 lines further down, replace legend("bottomleft", legend = "Cook's distance", lty = 2, col = 2, bty = "n") by legend("bottomleft", legend = "Cook's distance", lty = 2, col = 2, bty = "n", y.intersp=0.5) If this second change is not made, then one wants fracht <- (1.5*par() $cin[2])/par()$pin[2]I prefer the "Cook's distance" text to be a bit closer to the x- axis,as it separates it more clearly from any point labels.-- Brian D. Ripley, rip...@stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
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