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

UNDERRIDE/O |
    VERRIDE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,868       98.68       98.68
          1 |         24        0.24       98.92
          2 |          3        0.03       98.95
          3 |         15        0.15       99.10
          4 |          5        0.05       99.15
          5 |          1        0.01       99.16
          6 |          2        0.02       99.18
          7 |         34        0.34       99.52
          8 |          1        0.01       99.53
          9 |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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