Frequencies for pvin_3 variable in parkwork dataset :

        VIN |
Character(3 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.10        0.10
          0 |          8        0.80        0.90
          1 |         99        9.88       10.78
          2 |         36        3.59       14.37
          3 |         43        4.29       18.66
          4 |         91        9.08       27.74
          5 |          3        0.30       28.04
          6 |         29        2.89       30.94
          7 |         36        3.59       34.53
          8 |         30        2.99       37.52
          9 |         46        4.59       42.12
          A |         59        5.89       48.00
          B |         20        2.00       50.00
          C |         53        5.29       55.29
          D |         52        5.19       60.48
          E |         16        1.60       62.08
          F |          2        0.20       62.28
          G |         35        3.49       65.77
          H |          6        0.60       66.37
          J |          1        0.10       66.47
          K |         33        3.29       69.76
          L |         11        1.10       70.86
          M |         43        4.29       75.15
          N |         45        4.49       79.64
          P |         14        1.40       81.04
          R |          3        0.30       81.34
          S |         12        1.20       82.53
          T |        103       10.28       92.81
          U |         35        3.49       96.31
          V |         13        1.30       97.60
          W |          7        0.70       98.30
          X |          8        0.80       99.10
          Y |          5        0.50       99.60
          Z |          4        0.40      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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