Frequencies for pvin_9 variable in parkwork dataset :

        VIN |
Character(9 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          4        0.40        0.40
          0 |         96        9.58        9.98
          1 |         72        7.19       17.17
          2 |         87        8.68       25.85
          3 |         91        9.08       34.93
          4 |         76        7.58       42.51
          5 |         75        7.49       50.00
          6 |         89        8.88       58.88
          7 |        106       10.58       69.46
          8 |         92        9.18       78.64
          9 |        135       13.47       92.12
          J |          1        0.10       92.22
          K |          1        0.10       92.32
          T |          1        0.10       92.42
          X |         76        7.58      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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