Frequencies for powner variable in parkwork dataset :

 registered |
    vehicle |
      owner |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          3        0.27        0.27
          3 |         28        2.57        2.84
          6 |      1,060       97.16      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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