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

UNDERRIDE/O |
    VERRIDE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,876       98.76       98.76
          1 |         24        0.24       99.00
          2 |          3        0.03       99.03
          3 |         10        0.10       99.13
          4 |          5        0.05       99.18
          7 |         30        0.30       99.48
          9 |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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