Frequencies for pvin_2 variable in parkwork dataset :

        vin |
character(2 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          9        0.79        0.79
          1 |          3        0.26        1.05
          6 |          1        0.09        1.13
          8 |          1        0.09        1.22
          9 |         56        4.89        6.11
          A |         26        2.27        8.38
          B |         39        3.40       11.78
          C |         41        3.58       15.36
          D |         40        3.49       18.85
          E |          7        0.61       19.46
          F |        253       22.08       41.54
          G |        207       18.06       59.60
          H |        103        8.99       68.59
          J |         30        2.62       71.20
          K |          4        0.35       71.55
          L |         16        1.40       72.95
          M |         45        3.93       76.88
          N |         92        8.03       84.90
          P |          5        0.44       85.34
          R |          1        0.09       85.43
          S |         10        0.87       86.30
          T |         93        8.12       94.42
          U |          4        0.35       94.76
          V |         31        2.71       97.47
          W |          1        0.09       97.56
          X |         20        1.75       99.30
          Y |          4        0.35       99.65
          Z |          4        0.35      100.00
------------+-----------------------------------
      Total |      1,146      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016