Dear John, Thank you for that, and for explaining why the abline() command wont/dosen't work. The approach is based on reviewers comments that I am a tad sceptical about myself but yet curious enough to test their suggestion......I don't think it is very straightforward to explain; however, it involves using the residuals of the lm() and plotting them against a covariate to assess whether or not the deviation from the 1:1 relationship is in someway influenced by the other covariate. I hope that shines a small amount of light on this rather unorthodox approach?!
Many thanks again for that John! Ross -- View this message in context: http://r.789695.n4.nabble.com/Force-regression-line-to-a-1-1-relationship-tp3809733p3810101.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.
