Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd2000 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        418        4.18        4.18
          2 |         77        0.77        4.95
          3 |        100        1.00        5.95
          . |      9,405       94.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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