Frequencies for first 10,000 rows of role_cod variable in drug2006q2 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,967       59.67       59.67
          I |         30        0.30       59.97
         PS |      2,215       22.15       82.12
         SS |      1,788       17.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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