The plots you are looking for are called 'effect plots'. See the
effects package by John Fox.
Guillem R. wrote:
As far as I know, the predict command gives the predicted values (and
intervals) of y, but what I'm looking for is the conditional effects (betas)
of x on y conditional on values of z.
I'm trying to produce a plot similar to the first shown in this link:
http://homepages.nyu.edu/~mrg217/interaction.html#code
Thanks again
David Winsemius wrote:
On Jul 25, 2010, at 10:24 PM, Guillem R. wrote:
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)
? predict
Perhaps:
predict(lm1, newdata=data.frame(x=1:10, z=5), interval="confidence")
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
--
David Winsemius, MD
West Hartford, CT
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Michael Friendly Email: friendly AT yorku DOT ca
Professor, Psychology Dept.
York University Voice: 416 736-5115 x66249 Fax: 416 736-5814
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