Frequencies for first 10,000 rows of role_cod variable in drug2018q2 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,190       51.90       51.90
          I |         99        0.99       52.89
         PS |      1,406       14.06       66.95
         SS |      3,305       33.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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