Frequencies for first 10,000 rows of val_vbm variable in drug2009q2 dataset :

   Code for |
  source of |
   DRUGNAME |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,921       69.21       69.21
          2 |      3,073       30.73       99.94
          . |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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