Frequencies for first 10,000 rows of prescr6 variable in namcs1996 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        507        5.07        5.07
          2 |        103        1.03        6.10
          3 |         27        0.27        6.37
          . |      9,363       93.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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