Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd2002 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        475        4.75        4.75
          2 |         62        0.62        5.37
          3 |         41        0.41        5.78
          . |      9,422       94.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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