panel.2cat: Lattice panel function for confidence intervals with capped...
In DAMisc: Dave Armstrong's Miscellaneous Functions

Description Usage Arguments Author(s) Examples

This panel function is defined to plot confidence intervals in a multi-panel lattice display where the x-variable is categorical. Note, both lower and upper must be passed directly to xyplot as they will be passed down to the panel function.

1	panel.2cat(x, y, subscripts, lower, upper, length = 0.2)

`x, y`	Data from the call to `xyplot`.
`subscripts`	Variable used to created the juxtaposed panels.
`lower, upper`	95% lower and upper bounds of `y`.
`length`	Length of the arrow head lines.

Dave Armstrong

library(lattice)
library(effects)
data(Duncan, package="carData")
Duncan$inc.cat <- cut(Duncan$income, 3)
mod <- lm(prestige~ inc.cat * type + education,
  data=Duncan)
e1 <- effect("inc.cat*type", mod)
update(plot(e1), panel=panel.2cat)