Frequencies for first 10,000 rows of veh_cf1 variable in vehicle dataset :

    RELATED |
   FACTOR 1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,757       87.57       87.57
          1 |        147        1.47       89.04
          2 |         39        0.39       89.43
          3 |          3        0.03       89.46
          4 |          6        0.06       89.52
          5 |          8        0.08       89.60
          7 |          6        0.06       89.66
          8 |          2        0.02       89.68
          9 |          7        0.07       89.75
         14 |          3        0.03       89.78
         15 |          7        0.07       89.85
         16 |          7        0.07       89.92
         17 |         24        0.24       90.16
         18 |         15        0.15       90.31
         19 |         11        0.11       90.42
         31 |        400        4.00       94.42
         32 |         26        0.26       94.68
         33 |          1        0.01       94.69
         34 |         17        0.17       94.86
         35 |          6        0.06       94.92
         36 |          2        0.02       94.94
         38 |        287        2.87       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