Frequencies for first 10,000 rows of prescr3 variable in nhamcsed2001 dataset :

prescriptio |
   n status |
   code for |
    drug #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,621       16.21       16.21
          2 |        359        3.59       19.80
          3 |        259        2.59       22.39
          . |      7,761       77.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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