Frequencies for first 10,000 rows of prescr5 variable in nhamcsopd1998 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        544        5.44        5.44
          2 |         95        0.95        6.39
          3 |         51        0.51        6.90
          . |      9,310       93.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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