Frequencies for first 10,000 rows of role_cod variable in drug2012q2 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          5        0.05        0.05
          C |      4,958       49.58       49.63
          D |         16        0.16       49.79
          I |         56        0.56       50.35
         PS |      2,778       27.78       78.13
         SS |      2,186       21.86       99.99
          U |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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