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

UNDERRIDE/O |
    VERRIDE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,855       98.55       98.55
          1 |         32        0.32       98.87
          2 |          8        0.08       98.95
          3 |         14        0.14       99.09
          4 |          9        0.09       99.18
          5 |          3        0.03       99.21
          6 |          5        0.05       99.26
          7 |         32        0.32       99.58
          8 |          2        0.02       99.60
          9 |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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