Frequencies for pvin_3 variable in parkwork dataset :

        vin |
character(3 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          7        0.64        0.64
          1 |        110       10.10       10.74
          2 |         34        3.12       13.87
          3 |         49        4.50       18.37
          4 |        103        9.46       27.82
          5 |          2        0.18       28.01
          6 |         27        2.48       30.49
          7 |         23        2.11       32.60
          8 |         32        2.94       35.54
          9 |         26        2.39       37.92
          A |         67        6.15       44.08
          B |         26        2.39       46.46
          C |         54        4.96       51.42
          D |         75        6.89       58.31
          E |         17        1.56       59.87
          F |          2        0.18       60.06
          G |         33        3.03       63.09
          H |         22        2.02       65.11
          J |          5        0.46       65.56
          K |         37        3.40       68.96
          L |         10        0.92       69.88
          M |         40        3.67       73.55
          N |         54        4.96       78.51
          P |         14        1.29       79.80
          R |          7        0.64       80.44
          S |         15        1.38       81.82
          T |        105        9.64       91.46
          U |         40        3.67       95.13
          V |         29        2.66       97.80
          W |          9        0.83       98.62
          X |          7        0.64       99.27
          Y |          5        0.46       99.72
          Z |          3        0.28      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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