Frequencies for first 10,000 rows of role_cod variable in drug2016q2 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,552       55.52       55.52
          I |         31        0.31       55.83
         PS |      1,346       13.46       69.29
         SS |      3,071       30.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 6 Apr 2017