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

UNDERRIDE/O |
    VERRIDE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,863       98.63       98.63
          1 |         37        0.37       99.00
          2 |          5        0.05       99.05
          3 |         14        0.14       99.19
          4 |          6        0.06       99.25
          6 |          3        0.03       99.28
          7 |         37        0.37       99.65
          9 |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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