Frequencies for first 10,000 rows of role_cod variable in drug2007q1 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,023       50.23       50.23
          I |         41        0.41       50.64
         PS |      2,554       25.54       76.18
         SS |      2,382       23.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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