Frequencies for first 10,000 rows of role_cod variable in drug2007q3 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,735       57.35       57.35
          I |         76        0.76       58.11
         PS |      2,332       23.32       81.43
         SS |      1,857       18.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Dec 2015