Frequencies for first 10,000 rows of role_cod variable in drug2009q4 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,468       54.68       54.68
          I |         41        0.41       55.09
         PS |      2,495       24.95       80.04
         SS |      1,996       19.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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