Frequencies for first 10,000 rows of role_cod variable in drug2013q1 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,935       59.35       59.35
          I |         26        0.26       59.61
         PS |      1,553       15.53       75.14
         SS |      2,486       24.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Apr 2017