Hi. I'm embarking on my first attempt at creating my own panel
function for lattice graphics, and despite all of my online research
and pouring through the documentation, I cannot figure out how to
solve my particular problem. Hopefully, a generous fellow R user can
help.
I have some data that is split into two groups: some "actual" data,
and some simulated data, generated from several different models. The
actual data come from two different datasets (calibration and
holdout), and the simulations were calibrated on each data set under
the various models.
What I want to do is create a boxplot on the simulated data, and
superimpose a line representing the actual data. This plot would
condition on dataset and model. While the simulated data various
across model and dataset, the actual data varies only across dataset
and is common for all models.
My approach was to use panel.superpose, and create a panel function
that, depending on the group.number, calls either panel.bwplot or
panel.lines. Like this:
panel.custom.plot <- function (..., group.number) {
if (group.number == 1) {
panel.bwplot(...)
} else {
panel.lines(...)
}
}
obj <- bwplot(p ~ as.factor(count) | dataset + model, data = data.frame,
panel = panel.superpose,
groups = group,
panel.groups = panel.custom.plot
}
When I do this, I see the bwplot, but I cannot see the lines. It is
as though the data isn't being passed through.
Can someone help me get started with this, and instruct me a little
bit more on how arguments are passed from trellis functions to the
panel functions?
I did consider a second approach, where I don't use panel.superpose or
groups at all, but pass the actual.calib and actual.hold datasets as
parameters to a panel function. This panel function would call
panel.bwplot, and then, depending on the value of dataset, add lines
for either actual.calib or actual.hold. But I do not know how to let
the panel function know what level of a conditioning variable is being
plotted in a particular panel.
Thanks in advance for any help you can provide,
Michael
Michael Braun
Homer A. Burnell Career Development Professor
and Assistant Professor of Management Science (Marketing Group)
MIT Sloan School of Management
One Amherst St., E40-169
Cambridge, MA 02139
(617) 253-3436
[EMAIL PROTECTED]
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