Just to clarify things before trying to answer: by a "1:1 relationship" do you mean you want the regression slope to be equal to 1 "no matter what"?
Michael On Tue, Sep 13, 2011 at 7:03 AM, RCulloch <ross.cull...@dur.ac.uk> wrote: > 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. > [[alternative HTML version deleted]] ______________________________________________ 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.
