Frequencies for pvin_9 variable in parkwork dataset :

        vin |
character(9 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.26        0.26
          0 |        101        8.91        9.18
          1 |         97        8.56       17.74
          2 |         98        8.65       26.39
          3 |        112        9.89       36.28
          4 |         81        7.15       43.42
          5 |        107        9.44       52.87
          6 |         96        8.47       61.34
          7 |        101        8.91       70.26
          8 |        115       10.15       80.41
          9 |        114       10.06       90.47
          G |          1        0.09       90.56
          O |          1        0.09       90.64
          X |        106        9.36      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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