Hello, I appreciate this is likely to be an easy question. I am trying to obtain the residuals from a linear regression where the line is forced to have a 1:1 relationship.
An example of the data: A<-c(0.9803922, 1.3850416, 0.8241758, 0.0000000, 0.4672897, 1.1904762, 0.0000000, 0.9456265, 1.5151515) B<-c(1.3229572, 1.9471488, 1.3182674, 0.7007708, 1.0185740, 1.0268562, 0.8695652, 0.3016591, 1.9667171) plot(A, B, ylim=c(0,2), xlim=c(0,2)) abline(0,1, col="lightgrey", lty="dashed",lwd=2)#1:1 relationship = what I want to use in the lm() #Normal regression AB<-lm(A~B) #plot regression line abline(lm(AB)) How can I force the regression to have a 1:1 relationship, I assume it is to do with offset() but I have somewhat fried my brain trying numerous variations and I am not convinced any are correct. I was also hoping the plot function would show me that the calculation is correct, but any time I use the offset() command there is no line plotted? Any hints or tips would be much appreciated! Ross -- View this message in context: http://r.789695.n4.nabble.com/Force-regression-line-to-a-1-1-relationship-tp3809733p3809733.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
