Frequencies for psp_use variable in parkwork dataset :

Special Use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,045       98.21       98.21
          3 |          1        0.09       98.31
          5 |          9        0.85       99.15
          6 |          1        0.09       99.25
          8 |          1        0.09       99.34
         98 |          4        0.38       99.72
         99 |          3        0.28      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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