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curdag
2011 Aug 04
2
Efficient way of creating a shifted (lagged) variable?
Hello!
I have a data set:
set.seed(123)
y<-data.frame(week=seq(as.Date("2010-01-03"), as.Date("2011-01-31"),by="week"))
y$var1<-c(1,2,3,round(rnorm(54),1))
y$var2<-c(10,20,30,round(rnorm(54),1))
# All I need is to create lagged variables for var1 and var2. I looked
around a bit and found several ways of doing it. They all seem quite
complicated - while in