Stacking itemplot() with patchwork or plot_grid()

[Oliver D. Reithmaier]

Hi,

I was just wondering whether it would be possible to directly stack the plot outputs of itemplot() with package functions like patchwork or plot_grid() from cowplot. I was trying a bit and - as far as I can tell from the source code, mirt passes the parameters of the plot to lattice's xyplot...this should be includable in plot_grid() but I can't figure out how to exactly do this, because all itemplot() produces object wise is a parameter list. Is there a shortcut that I'm missing or do I need to feed all the parameters into xyplot manually?

Best,

Oliver

[Phil Chalmers]

patchwork should be able to do this, but you'll have to convert the objects from lattice to ggplot2 first. Here's an example:

###

library(mirt)
library(ggplotify)

mod <- mirt(Science)
itemplot(mod, 1) |> as.ggplot() -> i1
itemplot(mod, 2) |> as.ggplot() -> i2

library(patchwork)
i1 + i2

###

HTH.

Phil

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