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17960
2009 Jun 01
1
Generating a count variable
Dear All,
I am practicing data manipulation and I would like to generarte a count
variable. My data looks like this:
Country MID
1 NA
1 0
1 0
1 1
1 0
2 0
2 1
2 0
2 0
2 0
I would like to to generate a variable