Frequencies for pvin_11 variable in parkwork dataset :

        vin |
character(1 |
         1) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          6        0.53        0.53
          0 |         52        4.59        5.12
          1 |         30        2.65        7.77
          2 |         19        1.68        9.44
          3 |          6        0.53        9.97
          4 |         12        1.06       11.03
          5 |         21        1.85       12.89
          6 |         21        1.85       14.74
          7 |         21        1.85       16.59
          8 |         12        1.06       17.65
          9 |         44        3.88       21.54
          A |         35        3.09       24.62
          B |         32        2.82       27.45
          C |         76        6.71       34.16
          D |         45        3.97       38.13
          E |         52        4.59       42.72
          F |         47        4.15       46.87
          G |         32        2.82       49.69
          H |         75        6.62       56.31
          J |         37        3.27       59.58
          K |         40        3.53       63.11
          L |         46        4.06       67.17
          M |         31        2.74       69.90
          N |         59        5.21       75.11
          P |         26        2.29       77.41
          R |         39        3.44       80.85
          S |         45        3.97       84.82
          T |         17        1.50       86.32
          U |         65        5.74       92.06
          V |         10        0.88       92.94
          W |         23        2.03       94.97
          X |         10        0.88       95.85
          Y |         13        1.15       97.00
          Z |         34        3.00      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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