Frequencies for pv_config variable in parkwork dataset :

    vehicle |
configurati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        928       81.91       81.91
          1 |         46        4.06       85.97
          2 |         22        1.94       87.91
          4 |          8        0.71       88.61
          5 |          5        0.44       89.06
          6 |        103        9.09       98.15
          7 |          5        0.44       98.59
         19 |          6        0.53       99.12
         20 |          1        0.09       99.21
         21 |          3        0.26       99.47
         99 |          6        0.53      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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