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

UNDERRIDE/O |
    VERRIDE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,858       98.58       98.58
          1 |         23        0.23       98.81
          2 |          3        0.03       98.84
          3 |         18        0.18       99.02
          4 |          5        0.05       99.07
          6 |          4        0.04       99.11
          7 |         25        0.25       99.36
          9 |         64        0.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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