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apc8
2012 Oct 06
0
SPM/SemiPar -- Plotting additive interactions
...riate nonparamteric additive models.
The final bit of code is here:
finalfit <-
spm(res~f(V3,basis="trunc.poly")+f(V5,basis="trunc.poly")+f(V6,basis="trunc.poly"))
summary(finalfit)
par(mfrow = c(2,2))
plot(finalfit)
you can see the plot here: http://i.imgur.com/qaPc8.png
V3 is a main effect, V5 and V6 are interactions between dummy variables
and V3.
What I want to do is somehow combine V3 and V5, and V3 and V6.
Put differently, V5 shows the additive effect of the dummy variable to
V3 when the dummy equals 1. So V3+V5 shows the effect of interest when
the...