Frequencies for first 10,000 rows of role_cod variable in drug2017q4 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,058       50.58       50.58
          I |        103        1.03       51.61
         PS |      1,427       14.27       65.88
         SS |      3,412       34.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Jun 2018