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

  Number of |
     Engine |
     Cycles |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,897       88.97       88.97
          2 |          5        0.05       89.02
          4 |      1,098       10.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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