Frequencies for first 10,000 rows of prescr6 variable in nhamcsed2001 dataset :

prescriptio |
   n status |
   code for |
    drug #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        256        2.56        2.56
          2 |         43        0.43        2.99
          3 |         42        0.42        3.41
          . |      9,659       96.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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