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

UNDERRIDE/O |
    VERRIDE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,881       98.81       98.81
          1 |         25        0.25       99.06
          2 |          1        0.01       99.07
          3 |         12        0.12       99.19
          4 |          7        0.07       99.26
          5 |          1        0.01       99.27
          6 |          3        0.03       99.30
          7 |         19        0.19       99.49
          8 |          2        0.02       99.51
          9 |         49        0.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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