Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd1999 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        365        3.65        3.65
          2 |         44        0.44        4.09
          3 |         37        0.37        4.46
          . |      9,554       95.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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