within subjects, 3 conditions, 3 lines

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I think that you have correctly identified the problem.

Cheers,

Marko

I will attempt an answer to my own question. Possibly the reason I
got the same answer with the 3 methods is that my simulation was
wrong. It simulated the responses as:

y<- (cond=="a")*(a1 + a4*x) + (cond=="b")*(a1+a2 + (a4+a5)*x) + 
(cond=="c")*(a1+a3 + (a4+a6)*x) + rnorm(5*3*nsubj,mean=0,sd=.5)

This contains the intercepts and slopes which are unique to each
subject and randomly sampled from some population values. However
the term: rnorm(5*3*nsubj,mean=0,sd=.5) is wrong because it says
the errors are independent. Instead they should be correlated
within each subject.

I will give that a go.

Stan

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