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tli
2013 Mar 11
2
How to 'extend' a data.frame based on given variable combinations ?
Dear expeRts,
I have a data.frame with certain covariate combinations ('group' and 'year')
and corresponding values:
set.seed(1)
x <- data.frame(group = c(rep("A", 4), rep("B", 3)),
year = c(2001, 2003, 2004, 2005,
2003, 2004, 2005),
value = rexp(7))
My goal is essentially to