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

UNDERRIDE/O |
    VERRIDE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,877       98.77       98.77
          1 |         26        0.26       99.03
          2 |          6        0.06       99.09
          3 |         16        0.16       99.25
          4 |          8        0.08       99.33
          5 |          2        0.02       99.35
          6 |          5        0.05       99.40
          7 |         40        0.40       99.80
          8 |          1        0.01       99.81
          9 |         19        0.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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