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

  number of |
     engine |
     cycles |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,280       92.80       92.80
          2 |          5        0.05       92.85
          4 |        715        7.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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