Frequencies for pcylinder variable in parkwork dataset :

  number of |
  cylinders |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         58        5.32        5.32
         10 |          9        0.82        6.14
          2 |          6        0.55        6.69
          3 |          1        0.09        6.78
          4 |        283       25.94       32.72
          5 |          4        0.37       33.09
          6 |        479       43.90       76.99
          8 |        251       23.01      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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