Frequencies for first 10,000 rows of prescr5 variable in nhamcsed1999 dataset :

prescriptio |
   n status |
   code for |
    drug #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        376        3.76        3.76
          2 |         53        0.53        4.29
          3 |         51        0.51        4.80
          . |      9,520       95.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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