Frequencies for first 10,000 rows of role_cod variable in drug2018q1 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,309       53.09       53.09
          I |         55        0.55       53.64
         PS |      1,312       13.12       66.76
         SS |      3,324       33.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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