Frequencies for first 10,000 rows of val_vbm variable in drug2007q3 dataset :

   Code for |
  source of |
   DRUGNAME |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,125       71.25       71.25
          2 |      2,875       28.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Dec 2015