Frequencies for first 10,000 rows of prescr6 variable in nhamcsed1998 dataset :

prescriptio |
   n status |
   code for |
    drug #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        159        1.59        1.59
          2 |         21        0.21        1.80
          3 |         14        0.14        1.94
          . |      9,806       98.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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