Frequencies for powner variable in parkwork dataset :

 registered |
    vehicle |
      owner |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          4        0.37        0.37
          3 |         33        3.03        3.40
          6 |      1,052       96.60      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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