Frequencies for first 10,000 rows of prescr2 variable in namcs1996 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,086       60.86       60.86
          2 |        805        8.05       68.91
          3 |        515        5.15       74.06
          . |      2,594       25.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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