Frequencies for first 10,000 rows of val_vbm variable in drug2010q2 dataset :

   Code for |
  source of |
   DRUGNAME |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,087       70.87       70.87
          2 |      2,906       29.06       99.93
          . |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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