Frequencies for first 10,000 rows of role_cod variable in drug2004q3 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,970       59.70       59.70
          I |         20        0.20       59.90
         PS |      2,606       26.06       85.96
         SS |      1,404       14.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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