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

UNDERRIDE/O |
    VERRIDE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,864       98.64       98.64
          1 |         40        0.40       99.04
          2 |         11        0.11       99.15
          3 |         11        0.11       99.26
          4 |          5        0.05       99.31
          6 |          1        0.01       99.32
          7 |         32        0.32       99.64
          9 |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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