Frequencies for first 10,000 rows of veh_cf2 variable in vehicle dataset :

    RELATED |
   FACTOR 2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,733       97.33       97.33
          2 |          5        0.05       97.38
          3 |          2        0.02       97.40
          8 |          1        0.01       97.41
          9 |          1        0.01       97.42
         18 |          4        0.04       97.46
         31 |          5        0.05       97.51
         34 |          9        0.09       97.60
         38 |         21        0.21       97.81
         39 |          2        0.02       97.83
         99 |        217        2.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016