[R] Marginal effects from interaction regression model

[Guillem R.]

Dear all,

I'd like to plot the marginal effect of a variable in a multiplicative
interaction regression, that is, the effect of a variable conditional on the
values of another variable. As an illustration, given model lm1

lm1 <- lm(y ~ x*z)

I'd like to get the effects of x on y conditional on the values of z, with
the corresponding confidence intervals if possible. Does anyone know of any
package or simple way to do this?

Thanks


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