[R] modelling problem
Bill Simpson
wsi at gcal.ac.uk
Mon Jan 22 14:51:27 CET 2001
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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