Frequencies for first 10,000 rows of role_cod variable in drug2005q1 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,385       53.85       53.85
          I |         14        0.14       53.99
         PS |      2,984       29.84       83.83
         SS |      1,617       16.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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