Frequencies for first 10,000 rows of role_cod variable in drug2015q4 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,513       55.13       55.13
          I |         35        0.35       55.48
         PS |      1,580       15.80       71.28
         SS |      2,872       28.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 6 Apr 2017