Frequencies for powner variable in parkwork dataset :

 registered |
    vehicle |
      owner |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          5        0.44        0.44
          3 |         17        1.50        1.94
          6 |      1,112       97.89       99.82
          9 |          2        0.18      100.00
------------+-----------------------------------
      Total |      1,136      100.00

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