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

   ROLLOVER |
       TYPE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,007       80.07       80.07
          1 |      1,303       13.03       93.10
          2 |        571        5.71       98.81
          9 |        119        1.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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