Frequencies for first 10,000 rows of prescr4 variable in nhamcsopd2002 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,091       10.91       10.91
          2 |        134        1.34       12.25
          3 |         96        0.96       13.21
          . |      8,679       86.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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