How can we plot a lagged time series?
ggplot does not seem to have a lag.plot equivalent we can use tail to get a lagged version a vector:
tail(x,-1)
But within ggplot2 aesthetics must either be length one or having the same length, so we should append a value to the lagged one in order to plot it against the original vector. For example:
x= 1:10
qplot(x=x,y=c(tail(x,-1),0))
Another option is to use lag function from stats, but this assumes we are dealing with time series objects.
