Frequencies for first 10,000 rows of role_cod variable in drug2006q3 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,678       56.78       56.78
          I |         26        0.26       57.04
         PS |      2,348       23.48       80.52
         SS |      1,948       19.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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