Frequencies for pv_config variable in parkwork dataset :

    vehicle |
configurati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        909       83.32       83.32
          1 |         70        6.42       89.73
          2 |         19        1.74       91.48
          4 |          7        0.64       92.12
          5 |          2        0.18       92.30
          6 |         68        6.23       98.53
          7 |          1        0.09       98.63
         19 |          1        0.09       98.72
         21 |          9        0.82       99.54
         98 |          3        0.27       99.82
         99 |          2        0.18      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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