Greetings.
How can I insert gridlines
in the following density plot call?
Must one compose a panel function?
'data.frame': 46 obs. of 2 variables:
$ fallrates: num 5.2 7.1 7.1 9.8 3.7 7.5 5 6.2 1.5 2.9 ...
$ prepost : Factor w/ 2 levels "post","pre": 2 2 2 2 2 2 2 2 2 2 ...
library(lattice)
densityplot(~fallrates, groups = prepost,
kernal="triangular", lwd=2,
plot.points = TRUE, ref = TRUE, auto.key = list(columns = 2),
main="Estimated fall rate density, pre and post intevention")
Thank you for your consideration and comments.
Giles Crane
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