Frequencies for pv_config variable in parkwork dataset :

    vehicle |
configurati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        903       82.92       82.92
          1 |         66        6.06       88.98
          2 |         18        1.65       90.63
          4 |         12        1.10       91.74
          5 |          5        0.46       92.19
          6 |         70        6.43       98.62
          7 |          1        0.09       98.71
          8 |          1        0.09       98.81
         19 |          8        0.73       99.54
         20 |          1        0.09       99.63
         21 |          3        0.28       99.91
         99 |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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