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

  number of |
     engine |
     cycles |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,892       88.92       88.92
          2 |         12        0.12       89.04
          4 |      1,096       10.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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