Frequencies for ptowed variable in parkwork dataset :

    Vehicle |
    Removal |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        163       15.32       15.32
          2 |        311       29.23       44.55
          3 |        117       11.00       55.55
          4 |        317       29.79       85.34
          8 |         48        4.51       89.85
          9 |        108       10.15      100.00
------------+-----------------------------------
      Total |      1,064      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016