Frequencies for first 10,000 rows of prescr5 variable in nhamcsed1993 dataset :

prescriptio |
   n status |
   code for |
    drug #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        293        2.93        2.93
          2 |         46        0.46        3.39
          3 |         40        0.40        3.79
          . |      9,621       96.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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