Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd1994 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,210       12.10       12.10
          2 |        232        2.32       14.42
          3 |        165        1.65       16.07
          . |      8,393       83.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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