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

Carburetion |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,681       46.81       46.81
          1 |          4        0.04       46.85
          2 |         18        0.18       47.03
          3 |          3        0.03       47.06
          4 |         16        0.16       47.22
          F |      5,146       51.46       98.68
          T |        111        1.11       99.79
          Z |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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