Frequencies for first 10,000 rows of role_cod variable in drug2010q3 dataset :

   Code for |
     drug's |
   reported |
    role in |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.01        0.01
          C |      5,369       53.69       53.70
          D |          3        0.03       53.73
          I |         39        0.39       54.12
         PS |      2,377       23.77       77.89
         SS |      2,211       22.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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