Frequencies for first 10,000 rows of prescr2 variable in namcs2005 dataset :

prescriptio |
   n status |
   code for |
     med #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,970       39.70       39.70
          2 |        522        5.22       44.92
          3 |        313        3.13       48.05
          . |      5,195       51.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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