Dear all,
I want to replace an (unsorted) id variable in a large dataset by a running
number without changing the order of the cases.
E.g.,
y <- c(4,4,4,2,45,12,12)
should be replaced by something like
x <- c(1,1,1,2,3,4,4)
Sorry for this simple question & thank you very much for your help!
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