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

Location of |
   Rollover |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,110       81.10       81.10
          1 |        386        3.86       84.96
          2 |        113        1.13       86.09
          3 |        181        1.81       87.90
          4 |         18        0.18       88.08
          5 |      1,008       10.08       98.16
          6 |        156        1.56       99.72
          9 |         28        0.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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