Frequencies for pv_config variable in parkwork dataset :

    vehicle |
configurati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        971       84.73       84.73
          1 |         57        4.97       89.70
          2 |         16        1.40       91.10
          4 |         11        0.96       92.06
          5 |          4        0.35       92.41
          6 |         76        6.63       99.04
          7 |          1        0.09       99.13
         19 |          4        0.35       99.48
         21 |          3        0.26       99.74
         99 |          3        0.26      100.00
------------+-----------------------------------
      Total |      1,146      100.00

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