Hi Sacha, The line you have requested is off the plot. The following will produce what I think you are asking, but I cannot speak for whether it means anything sensible.
plot(GDP.per.head, fitted(LinearModel.1),ylim=c(200,800)) devlm1<-lm(fitted(LinearModel.1)~GDP.per.head) abline(devlm1) conflm1<-confint(devlm1) abline(coef=conflm1[,1],lty=2) abline(coef=conflm1[,2],lty=2) Jim On Wed, May 6, 2015 at 8:01 AM, varin sacha <varinsa...@yahoo.fr> wrote: > Hi, Dear R-helpers, > > Here below you will find a reproducible fictitious example working except the > "abline" function. > > First thing : I try to draw the regression line (multiple linear regression). > I try the "abline" function but it does not work. I don't get any error > message but the straight line does not appear on the scatterplot. > > Second thing : I try to draw the 95% confidence intervals on the regression > line. How could I do ? > > Using abline(0,1), I can of course add a line 45 degrees angle passing > through the origin (intercept=0 and slope=1), but it is not what I am looking > for. > > GDP.per.head=c(600,560,340,560,580,300,570,900,680,290,590,340) > Quality.score=c(4.5,6.5,6,4.5,7,3,9,10,12.5,6.5,7,9) > Competitivness.score=c(1000,1200,1400,700,680,1010,340,560,690,500,690,460) > LinearModel.1=lm(GDP.per.head ~ Quality.score + Competitivness.score) > plot(GDP.per.head, fitted(LinearModel.1)) > abline(GDP.per.head, fitted(LinearModel.1)) > > Thanks for your help. Looking forward to reading you. > > Sacha > > ______________________________________________ > 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.
