Frequencies for first 10,000 rows of role_cod variable in drug2006q4 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,772       57.72       57.72
          I |         16        0.16       57.88
         PS |      2,384       23.84       81.72
         SS |      1,828       18.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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