Frequencies for first 10,000 rows of prescr2 variable in namcs2001 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,692       26.92       26.92
          2 |        281        2.81       29.73
          3 |        183        1.83       31.56
          . |      6,844       68.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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