Frequencies for first 10,000 rows of role_cod variable in drug2008q1 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,636       56.36       56.36
          I |         20        0.20       56.56
         PS |      2,370       23.70       80.26
         SS |      1,974       19.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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