[R]  Equivalent to Stata egen tag
    Denis Kazakevich 
    den2042 at yahoo.com
       
    Mon Jan 17 00:48:30 CET 2011
    
    
  
What are the R equivalents to the Stata command egen tag 
and
egen count?
egen station_week_tag = tag(station week) 
Thank you
    
    
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