Hi All,
I am trying to understand panel functions. Let's use this example.
library(lattice)
time<-c(rep(1:10,5))
y <-time+rnorm(50,5,2)
group<-c(rep('A',30),rep('B',20))
subject<-c(rep('a',10),rep('b',10),rep('c',10),rep('d',10),rep('e',10))
myData <-data.frame(subject,group,time,y)
head(myData)
Plot 1
xyplot(y ~ time | group, data = myData, groups = subject,
panel = panel.superpose,
panel.groups = function(...)
panel.loess(...)
)
Plot 2
xyplot(y ~ time | group, data = myData, groups = subject,
panel = function(...) {
panel = panel.superpose(...)
panel.groups = function(...)
panel.loess(...)
})
Why does Plot 2 not produce the loess curves? Why are points not
plotted on Plot 1?
Plot 3
xyplot(y ~ time | group, data = myData, groups = subject,
panel = function(...) {
panel.superpose(...)
panel.superpose(panel.groups = panel.loess, ...)
})
What is the effect of writing panel.superpose twice? What is it about
this call that makes the data points
appear on the graph?
Thanks,
Juliet
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