Frequencies for ptype variable in parkwork dataset :

  unit type |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |        676       58.99       58.99
          3 |        446       38.92       97.91
          4 |         24        2.09      100.00
------------+-----------------------------------
      Total |      1,146      100.00

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