Frequencies for first 10,000 rows of val_vbm variable in drug2010q4 dataset :

   Code for |
  source of |
   DRUGNAME |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,805       68.05       68.05
          2 |      3,192       31.92       99.97
          . |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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