Frequencies for first 10,000 rows of prescr5 variable in nhamcsopd2001 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        806        8.06        8.06
          2 |        109        1.09        9.15
          3 |         99        0.99       10.14
          . |      8,986       89.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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