Frequencies for first 10,000 rows of dr_train variable in vehicle dataset :

     Driver |
   Training |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        686        6.86        6.86
          1 |         48        0.48        7.34
          2 |          2        0.02        7.36
          3 |          8        0.08        7.44
          4 |         32        0.32        7.76
          5 |          1        0.01        7.77
          6 |          5        0.05        7.82
          9 |      9,218       92.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016