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pgdat
2016 Apr 19
2
Creating two new variables conditional on retaining values from previous rows
Hello,
Iam looking for an R solution that can efficiently produce the output shown below. I can produce this easily in SAS with retain statement and a few lines of if-then-else logic, etc.. but I am not find anything similar on the Rforum archives. Below is the logic I am trying to apply to produce the output table below. Thanks in any help!
if the ID is the first ID encountered then group=1 and