Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd1996 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        383        3.83        3.83
          2 |         59        0.59        4.42
          3 |         37        0.37        4.79
          . |      9,521       95.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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