Frequencies for pvin_10 variable in parkwork dataset :

        vin |
character(1 |
         0) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.26        0.26
          0 |         12        1.05        1.31
          1 |         52        4.54        5.85
          2 |         52        4.54       10.38
          3 |         75        6.54       16.93
          4 |         55        4.80       21.73
          5 |         74        6.46       28.18
          6 |         65        5.67       33.86
          7 |         58        5.06       38.92
          8 |         59        5.15       44.07
          9 |         91        7.94       52.01
          A |         39        3.40       55.41
          B |         55        4.80       60.21
          C |         69        6.02       66.23
          D |         30        2.62       68.85
          E |         13        1.13       69.98
          G |          6        0.52       70.51
          H |          4        0.35       70.86
          J |          6        0.52       71.38
          K |          6        0.52       71.90
          L |          6        0.52       72.43
          M |          4        0.35       72.77
          N |         11        0.96       73.73
          P |         17        1.48       75.22
          R |         13        1.13       76.35
          S |         30        2.62       78.97
          T |         36        3.14       82.11
          V |         39        3.40       85.51
          W |         36        3.14       88.66
          X |         63        5.50       94.15
          Y |         67        5.85      100.00
------------+-----------------------------------
      Total |      1,146      100.00

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