Frequencies for first 10,000 rows of prescr6 variable in nhamcsed1995 dataset :

prescriptio |
   n status |
   code for |
    drug #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        150        1.50        1.50
          2 |         23        0.23        1.73
          3 |         14        0.14        1.87
          . |      9,813       98.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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