Dear R users,
I am working with panel data and I want the difference of a variable with
its t+1 value.
For example, I have a data frame as below.
> a <- data.frame(c(rep(2,5), rep(3,5)), c(2005:2009, 2004:2008),
c(NA,10,34,23,12, 23,45, NA, 45, NA))
> colnames(a) <- c("firm","year","var")
I want the output to be as follows.
> b <- data.frame(c(rep(2,5), rep(3,5)), c(2005:2009, 2004:2008),
c(NA,10,34,23,12, 23,45, NA, 45, NA),c(10,34,23,12,NA,45, NA, 45, NA, NA))
> colnames(b) <- c("firm","year","var","var.lead")
> b
firm year var var.lead
1 2 2005 NA 10
2 2 2006 10 34
3 2 2007 34 23
4 2 2008 23 12
5 2 2009 12 NA
6 3 2004 23 45
7 3 2005 45 NA
8 3 2006 NA 45
9 3 2007 45 NA
10 3 2008 NA NA
Could you tell me if such a function exists in the plm package?
Thank you
--
Apoorva Gupta
Consultant
National Institute of Public Finance and Policy
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