Frequencies for first 10,000 rows of prescr5 variable in nhamcsopd1999 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        595        5.95        5.95
          2 |         91        0.91        6.86
          3 |         69        0.69        7.55
          . |      9,245       92.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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