interaction plot using ggplot2

Question

The following code shows an interaction plot using the effects library:

model <- lm(mpg ~ hp + wt + hp:wt, data=mtcars)
library(effects)
plot(effect("hp:wt", model, list(wt=c(2.2,3.2,4.2))), multiline=TRUE)

enter image description here

I tried making the same model but holding wt at 2.2, but this model could not calculate the coefficient for wt:

mtcars$wt_2.2 <- 2.2
model2.2 <- lm(mpg ~ hp + wt_2.2 + hp:wt, data=mtcars)
coef(model2.2)

How can I make the same plot using ggplot2?

What have you tried? As it stands, the question is in danger of being closed and tossed into the river. — Roman Luštrik
– Roman Luštrik, Commented Nov 14, 2013 at 8:29

rcs · Accepted Answer · 2013-11-14 09:53:00Z

5

tmp <- as.data.frame(effect("hp:wt", model, list(wt=c(2.2,3.2,4.2))))
ggplot(data=tmp, aes(x=hp, y=fit, colour=as.factor(wt))) +
       geom_line() +
       labs(colour="wt")

plot

answered Nov 14, 2013 at 9:53

rcs

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