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

 Motorcycle |
         CC |
Displacemen |
          t |      Freq.     Percent        Cum.
------------+-----------------------------------
       1220 |          4        0.04        0.04
       1730 |          2        0.02        0.06
       1980 |          2        0.02        0.08
       2480 |          1        0.01        0.09
       3250 |         18        0.18        0.27
       3470 |          3        0.03        0.30
       3480 |          1        0.01        0.31
       3560 |          7        0.07        0.38
       4080 |          6        0.06        0.44
       4440 |         10        0.10        0.54
       4980 |          9        0.09        0.63
       5440 |          9        0.09        0.72
       7360 |         27        0.27        0.99
       9990 |          1        0.01        1.00
       9999 |      3,984       39.84       40.84
          . |      5,916       59.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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