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

carburetion |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,497       44.97       44.97
          1 |          7        0.07       45.04
          2 |         21        0.21       45.25
          3 |          3        0.03       45.28
          4 |         14        0.14       45.42
          F |      5,288       52.88       98.30
          T |        150        1.50       99.80
          Z |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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