Frequencies for pvin_3 variable in parkwork dataset :

        VIN |
Character(3 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          2        0.19        0.19
          0 |         13        1.22        1.41
          1 |         98        9.21       10.62
          2 |         47        4.42       15.04
          3 |         55        5.17       20.21
          4 |        108       10.15       30.36
          5 |          5        0.47       30.83
          6 |         23        2.16       32.99
          7 |         30        2.82       35.81
          8 |         20        1.88       37.69
          9 |         33        3.10       40.79
          A |         64        6.02       46.80
          B |         30        2.82       49.62
          C |         54        5.08       54.70
          D |         52        4.89       59.59
          E |         17        1.60       61.18
          G |         36        3.38       64.57
          H |         10        0.94       65.51
          J |          8        0.75       66.26
          K |         24        2.26       68.52
          L |          6        0.56       69.08
          M |         56        5.26       74.34
          N |         48        4.51       78.85
          P |         13        1.22       80.08
          R |          7        0.66       80.73
          S |         20        1.88       82.61
          T |        105        9.87       92.48
          U |         42        3.95       96.43
          V |          8        0.75       97.18
          W |         14        1.32       98.50
          X |         10        0.94       99.44
          Y |          1        0.09       99.53
          Z |          5        0.47      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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