Lattice barchart with error bars

Shaun:

I understand that this type of plot is standard in many disciplines,
but it really is awful (google on 'Dynamite plots' for some more
erudite perspectives). Have you considered bwplot() for your
unaggregated data instead?

(No need to reply. It's July 4, and I'm just waving a little flag for
better graphs).

Cheers,
Bert

Hi,

I'd like to draw a lattice barchart of means with error bars to show
the standard deviation. I have the barchart, how do I add the error
bars?

require(datasets)
require(lattice)
x <- aggregate(weight ~ Diet, ChickWeight, function(x) c(mean=mean(x),
sd=sd(x)))
barchart(weight[,'mean'] ~ Diet, x)

Thanks,
Shaun

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Bert Gunter
Genentech Nonclinical Biostatistics

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