Frequencies for first 10,000 rows of role_cod variable in drug2016q4 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,252       52.52       52.52
          I |         37        0.37       52.89
         PS |      1,218       12.18       65.07
         SS |      3,493       34.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Sep 2017