Frequencies for first 10,000 rows of role_cod variable in drug2012q3 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          2        0.02        0.02
      22250 |          1        0.01        0.03
          C |      5,166       51.66       51.69
          D |          1        0.01       51.70
          I |         59        0.59       52.29
         PS |      2,404       24.04       76.33
         SS |      2,365       23.65       99.98
          U |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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