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slope
2001 Oct 08
3
testing diff for slopes and intercepts
I fit the model
fit<-lm(thresh~cond*Ne)
where
thresh is the reponse
cond is a factor with levels a, b, and c
Ne is a continuous indep var
I think of this full model as having three lines: thresh as a function of
Ne for each condition. Thus we have slopea, slopeb, slopec, inta, intb,
intc.
lm output my params
-------------------------
(Intercept) inta
condb intb - inta
condc intc - inta
Ne slopea
condb:Ne slopeb - slopea
condc:Ne slopec - slopea
This parametrization automatically compares
inta vs intb...