Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd1997 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        303        3.03        3.03
          2 |         58        0.58        3.61
          3 |         25        0.25        3.86
          . |      9,614       96.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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