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

 Motorcycle |
         CC |
Displacemen |
          t |      Freq.     Percent        Cum.
------------+-----------------------------------
        990 |          2        0.02        0.02
       1220 |          2        0.02        0.04
       1230 |          1        0.01        0.05
       1730 |          6        0.06        0.11
       3250 |         10        0.10        0.21
       3470 |          6        0.06        0.27
       3480 |          5        0.05        0.32
       3560 |          3        0.03        0.35
       4080 |          1        0.01        0.36
       4440 |          5        0.05        0.41
       4980 |          1        0.01        0.42
       5440 |          2        0.02        0.44
       7360 |         26        0.26        0.70
       9999 |      4,306       43.06       43.76
          . |      5,624       56.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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