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

  Number of |
     Engine |
     Cycles |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,338       93.38       93.38
          2 |          2        0.02       93.40
          4 |        660        6.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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