Frequencies for ptype variable in parkwork dataset :

  Unit Type |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |        536       50.38       50.38
          3 |        499       46.90       97.27
          4 |         29        2.73      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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