Frequencies for first 10,000 rows of prescr4 variable in nhamcsopd1992 dataset :

Prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        595        5.95        5.95
          2 |        108        1.08        7.03
          3 |         94        0.94        7.97
          . |      9,203       92.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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