Frequencies for first 10,000 rows of role_cod variable in drug2004q2 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,991       59.91       59.91
          I |         13        0.13       60.04
         PS |      2,440       24.40       84.44
         SS |      1,556       15.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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