Frequencies for first 10,000 rows of prescr5 variable in nhamcsed1996 dataset :

prescriptio |
   n status |
   code for |
    drug #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        385        3.85        3.85
          2 |         52        0.52        4.37
          3 |         51        0.51        4.88
          . |      9,512       95.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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