Frequencies for first 10,000 rows of prescr3 variable in namcs2005 dataset :

prescriptio |
   n status |
   code for |
     med #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,670       26.70       26.70
          2 |        339        3.39       30.09
          3 |        172        1.72       31.81
          . |      6,819       68.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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