Frequencies for ptowed variable in parkwork dataset :

    vehicle |
    removal |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        204       18.70       18.70
          2 |        299       27.41       46.10
          3 |        141       12.92       59.03
          4 |        347       31.81       90.83
          8 |         56        5.13       95.97
          9 |         44        4.03      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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