On Fri, 6 Sep 2013, S Ellison wrote:
#Test data
ym <-as.data.frame(expand.grid(Y=c(2004:2006, 2010:2012), A=1:4)) #A is an
arbitrary variable to give us some panels.
ym$x <- runif(nrow(ym))
library(lattice)
#Plots without, andf with, a groups argument
xyplot(x~Y|A, data=ym, type="l")
xyplot(x~Y|A, data=ym, type="l", groups=ym$Y<2007)
Is that what you had in mind?
Yes, it is. Thanks very much for the lesson is using groups.
Rich
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