Frequencies for first 10,000 rows of role_cod variable in drug2009q3 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,531       55.31       55.31
          I |         59        0.59       55.90
         PS |      2,314       23.14       79.04
         SS |      2,096       20.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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