Frequencies for pvin_9 variable in parkwork dataset :

        vin |
character(9 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.28        0.28
          0 |        116       10.65       10.93
          1 |         94        8.63       19.56
          2 |         91        8.36       27.92
          3 |         83        7.62       35.54
          4 |         92        8.45       43.99
          5 |        111       10.19       54.18
          6 |        105        9.64       63.82
          7 |         88        8.08       71.90
          8 |         94        8.63       80.53
          9 |        126       11.57       92.10
          R |          1        0.09       92.19
          X |         85        7.81      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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