Frequencies for first 10,000 rows of role_cod variable in drug2007q4 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,718       57.18       57.18
          I |         21        0.21       57.39
         PS |      2,625       26.25       83.64
         SS |      1,636       16.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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