Frequencies for first 10,000 rows of prescr2 variable in namcs2003 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,239       32.39       32.39
          2 |        313        3.13       35.52
          3 |        237        2.37       37.89
          . |      6,211       62.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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