Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd1995 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        296        2.96        2.96
          2 |         58        0.58        3.54
          3 |         27        0.27        3.81
          . |      9,619       96.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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