Frequencies for first 10,000 rows of prescr3 variable in namcs1996 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,906       29.06       29.06
          2 |        450        4.50       33.56
          3 |        220        2.20       35.76
          . |      6,424       64.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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