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

   Rollover |
       Type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,110       81.10       81.10
          1 |      1,583       15.83       96.93
          2 |        281        2.81       99.74
          9 |         26        0.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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