Frequencies for first 10,000 rows of prescr1 variable in nhamcsopd1997 dataset :

prescriptio |
   n status |
   code for |
 medication |
          # |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,400       44.00       44.00
          2 |        966        9.66       53.66
          3 |        514        5.14       58.80
          . |      4,120       41.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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