Frequencies for first 10,000 rows of role_cod variable in drug2017q1 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,526       55.26       55.26
          I |         54        0.54       55.80
         PS |      1,284       12.84       68.64
         SS |      3,136       31.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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