Frequencies for first 10,000 rows of prescr4 variable in nhamcsed2000 dataset :

prescriptio |
   n status |
   code for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        698        6.98        6.98
          2 |        144        1.44        8.42
          3 |        118        1.18        9.60
          . |      9,040       90.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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