[R] Force regression line to a 1:1 relationship

[RCulloch]

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



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