Lagging Forward in plm

EDIT2: lagging forward (=leading values) is implemented in plm CRAN releases >= 1.6-4 . Functions are either lead() or lag() (latter with a negative integer for leading values).

Take care of any other packages attached that use the same function names. To be sure, you can refer to the function by the full namespace, e.g., plm::lead.

Examples from ?plm::lead:

# First, create a pdata.frame
data("EmplUK", package = "plm")
Em <- pdata.frame(EmplUK)

# Then extract a series, which becomes additionally a pseries
z <- Em$output
class(z)

# compute negative lags (= leading values)
lag(z, -1)
lead(z, 1) # same as line above
identical(lead(z, 1), lag(z, -1)) # TRUE