Frequencies for first 10,000 rows of role_cod variable in drug2011q3 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          2        0.02        0.02
          C |      5,646       56.46       56.48
          D |         12        0.12       56.60
          I |         49        0.49       57.09
         PS |      2,472       24.72       81.81
         SS |      1,819       18.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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