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

UNDERRIDE/O |
    VERRIDE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,895       98.95       98.95
          1 |         29        0.29       99.24
          2 |          4        0.04       99.28
          3 |          9        0.09       99.37
          4 |          6        0.06       99.43
          5 |          1        0.01       99.44
          6 |          1        0.01       99.45
          7 |         30        0.30       99.75
          8 |          1        0.01       99.76
          9 |         24        0.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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