Frequencies for pvin_4 variable in parkwork dataset :

        VIN |
Character(4 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.10        0.10
          0 |          9        0.90        1.00
          1 |          7        0.70        1.70
          2 |          2        0.20        1.90
          3 |          4        0.40        2.30
          4 |          2        0.20        2.50
          5 |          7        0.70        3.19
          6 |          2        0.20        3.39
          7 |          5        0.50        3.89
          8 |          2        0.20        4.09
          9 |         46        4.59        8.68
          A |         62        6.19       14.87
          B |         56        5.59       20.46
          C |         54        5.39       25.85
          D |         62        6.19       32.04
          E |        115       11.48       43.51
          F |         69        6.89       50.40
          G |         60        5.99       56.39
          H |         74        7.39       63.77
          J |         44        4.39       68.16
          K |         32        3.19       71.36
          L |         21        2.10       73.45
          M |         21        2.10       75.55
          N |         25        2.50       78.04
          P |         11        1.10       79.14
          R |         33        3.29       82.44
          S |         35        3.49       85.93
          T |          3        0.30       86.23
          U |         10        1.00       87.23
          V |          7        0.70       87.92
          W |         45        4.49       92.42
          X |          9        0.90       93.31
          Y |         29        2.89       96.21
          Z |         38        3.79      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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