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

UNDERRIDE/O |
    VERRIDE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,893       98.93       98.93
          1 |         22        0.22       99.15
          2 |          7        0.07       99.22
          3 |         22        0.22       99.44
          4 |          6        0.06       99.50
          5 |          1        0.01       99.51
          6 |          4        0.04       99.55
          7 |         26        0.26       99.81
          8 |          2        0.02       99.83
          9 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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