Trouble plotting interaction with brkdn.plot from plotrix package
Thank you very much! Pete
On Mar 16, 2016, at 2:16 AM, PIKAL Petr <petr.pikal at precheza.cz> wrote: Hi Thanks for providing working example. See in line
-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Miksza,
Peter John
Sent: Wednesday, March 16, 2016 1:46 AM
To: r-help at r-project.org
Subject: [R] Trouble plotting interaction with brkdn.plot from plotrix
package
Hello,
I'm exploring different ways to plot interactions for mixed-design
ANOVA and am having difficulty getting the brkdn.plot() function in the
R plotrix package to work.
The interaction.plot() is working fine, but I'd really like to be able
to customize the plot more as the brkdn.plot() function seems to be
able to do.
Any help pointing out my error(s) would be much appreciated.
Pete Miksza
IU Jacobs School of Music, Bloomington, IN
Here is an example of my code:
set.seed(1976)
Y = rnorm(1600, 5, 2)
A = c(rep(1, 200), rep(2, 200), rep(1, 200), rep(2, 200), rep(1, 200),
rep(2, 200), rep(1, 200), rep(2, 200))
B = c(rep(1, 400), rep(2, 400), rep(3, 400), rep(4, 400))
A = factor(A, levels = c(1, 2), labels = c("Treat", "Control"))
B = factor(B, levels = c(1, 2, 3, 4), labels = c("One", "Two", "Three",
"Four"))
dat = data.frame(Y, A, B)
str(dat)
# I can't figure out why this doesn't work
library(plotrix)
brkdn.plot("dat$Y", "dat$B", "dat$A", data = dat)
You shall call only variable names not data frame itself.
brkdn.plot("Y", "B", "A", data = dat)
brkdn.plot(Y~B+A, data = dat)
works
Cheers
Petr
# this works
interaction.plot(dat$B, dat$A, dat$Y, fun = mean)
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