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mydatasum
2008 May 16
1
xyplot: subscripts, groups and subset
I have stumbled across something in the Lattice package that is vexing me.
Consider the code below:
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library(lattice)
myData <- expand.grid(sub = factor(1:16), time = 1:10)
myData$observed <- rnorm(nrow(myData))
myData$fitted <- with(myData, ave(observed, sub, FUN = mean))
myData$event.time <- with(myData, ave(observed, sub,