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

UNDERRIDE/O |
    VERRIDE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,865       98.65       98.65
          1 |         19        0.19       98.84
          2 |         11        0.11       98.95
          3 |         17        0.17       99.12
          4 |          3        0.03       99.15
          5 |          1        0.01       99.16
          6 |          7        0.07       99.23
          7 |         40        0.40       99.63
          8 |          2        0.02       99.65
          9 |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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