[R] modelling problem

[Bill Simpson]

I have three different conditions: detect, discrim, sum.
In each condition I measure y at two different x levels.
Thus I have 6 points.

Theory says that the data should obey:

y ~ (x+a)/b		if cond==detect
y ~ (x+a)/(2*b*(1-c))	if cond==discrim
y ~ (x+a)/(2*b*(1+c))	if cond==sum

These are 3 lines, one per condition. I need to estimate a, b, and c.
How to do it in R? (I imagine that lm() will do it somehow)

Thanks very much for any help.

Bill Simpson

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