Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd1995 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,542       15.42       15.42
          2 |        236        2.36       17.78
          3 |        170        1.70       19.48
          . |      8,052       80.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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