Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd1998 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        311        3.11        3.11
          2 |         58        0.58        3.69
          3 |         26        0.26        3.95
          . |      9,605       96.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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