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2011 Mar 03
3
creating a count variable in R
Hi R helpers, I'm trying to create a count in R , but as there is no retain function like in SAS I'm running into difficulties. I have the following : Date_var and wish to obtain Date_var Count_var 01/01/2011 01/01/2011 1 01/01/2011 01/01/2011 2 02/01/2011...