Frequencies for first 10,000 rows of role_cod variable in drug2008q3 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          C |      5,637       56.37       56.37
          D |          4        0.04       56.41
          I |         48        0.48       56.89
         PS |      2,423       24.23       81.12
         SS |      1,887       18.87       99.99
          Y |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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