> Now I have question: what about y=b fitting? is there any model to
> force or impose the ax to be zero
Rui Barradas has answered correctly for a simple lm case.
You can also do
lm(y~1) to obtain an estimated mean.
That formulation happens to be quite useful if you are interested in a purely
random-effects model* fitted using, say, lme, though you won't generally get a
simple mean for unbalanced data in such a case.
S Ellison
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