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

   rollover |
       type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,270       82.70       82.70
          1 |      1,494       14.94       97.64
          2 |        218        2.18       99.82
          9 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016