Here is some sample code that shows 2 different approaches, which you want to use depends on what exactly you want to do and which will be easier for you, the one draws the normal around the 6,7 point, the other around the 3,4 point, change those values to do your plot:
plot(1:10, 2:11) xx <- seq(-3,3,.1) lines( 6+dnorm(xx,0,.75), 7+xx ) library(TeachingDemos) subplot( plot(dnorm(xx),xx, type='l', axes=F,xlab='',ylab=''), 3,4, hadj=0 ) Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Doran, Harold Sent: Tuesday, October 31, 2006 6:26 AM To: [email protected] Subject: [R] Put a normal curve on plot I would like to be able to place a normal distribution surrounding the predicted values at various places on a plot. Below is some toy code that creates a scatterplot and plots a regression line through the data. library(MASS) mu <- c(0,1) Sigma <- matrix(c(1,.8,.8,1), ncol=2) set.seed(123) x <- mvrnorm(50,mu,Sigma) plot(x) abline(lm(x[,2] ~ x[,1])) Say I want to add a normal distribution surrounding the predicted values at the x-values of -1, 0, and 1. That is, at the points \hat{y} = \mu + \beta_1(-1) \hat{y} = \mu + \beta_1(0) \hat{y} = \mu + \beta_1(1) How might I go about doing this? Harold > version _ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status major 2 minor 4.0 year 2006 month 10 day 03 svn rev 39566 language R version.string R version 2.4.0 (2006-10-03) [[alternative HTML version deleted]] ______________________________________________ [email protected] 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. ______________________________________________ [email protected] 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.
