Frequencies for pvin_9 variable in parkwork dataset :

        VIN |
Character(9 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.28        0.28
          0 |        109       10.24       10.53
          1 |         84        7.89       18.42
          2 |         89        8.36       26.79
          3 |         98        9.21       36.00
          4 |         83        7.80       43.80
          5 |         94        8.83       52.63
          6 |         94        8.83       61.47
          7 |        117       11.00       72.46
          8 |         77        7.24       79.70
          9 |        134       12.59       92.29
          P |          1        0.09       92.39
          X |         81        7.61      100.00
------------+-----------------------------------
      Total |      1,064      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016