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

   rollover |
       type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,421       84.21       84.21
          1 |      1,380       13.80       98.01
          2 |        179        1.79       99.80
          9 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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