Frequencies for first 10,000 rows of prescr7 variable in namcs2003 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        417        4.17        4.17
          2 |         52        0.52        4.69
          3 |         34        0.34        5.03
          . |      9,497       94.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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