Frequencies for first 10,000 rows of role_cod variable in drug2017q2 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,436       54.36       54.36
          I |         51        0.51       54.87
         PS |      1,291       12.91       67.78
         SS |      3,222       32.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 Feb 2018