Frequencies for first 10,000 rows of prescr5 variable in nhamcsed2001 dataset :

prescriptio |
   n status |
   code for |
    drug #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        434        4.34        4.34
          2 |         78        0.78        5.12
          3 |         78        0.78        5.90
          . |      9,410       94.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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