Frequencies for first 10,000 rows of role_cod variable in drug2013q2 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,732       57.32       57.32
          I |        111        1.11       58.43
         PS |      1,577       15.77       74.20
         SS |      2,580       25.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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