Frequencies for powner variable in parkwork dataset :

 registered |
    vehicle |
      owner |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          5        0.44        0.44
          3 |         17        1.48        1.92
          6 |      1,124       98.08      100.00
------------+-----------------------------------
      Total |      1,146      100.00

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