Frequencies for first 10,000 rows of prescr2 variable in namcs1994 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,502       35.02       35.02
          2 |        421        4.21       39.23
          3 |        332        3.32       42.55
          . |      5,745       57.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016