Frequencies for pvin_8 variable in parkwork dataset :

        VIN |
Character(8 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.28        0.28
          0 |         15        1.41        1.69
          1 |         34        3.20        4.89
          2 |         31        2.91        7.80
          3 |         30        2.82       10.62
          4 |         42        3.95       14.57
          5 |         46        4.32       18.89
          6 |         17        1.60       20.49
          7 |         21        1.97       22.46
          8 |          9        0.85       23.31
          9 |         43        4.04       27.35
          A |          8        0.75       28.10
          B |         26        2.44       30.55
          C |         31        2.91       33.46
          D |         33        3.10       36.56
          E |         65        6.11       42.67
          F |         30        2.82       45.49
          G |         30        2.82       48.31
          H |         22        2.07       50.38
          J |         12        1.13       51.50
          K |         64        6.02       57.52
          L |         32        3.01       60.53
          M |         30        2.82       63.35
          N |         40        3.76       67.11
          P |         18        1.69       68.80
          R |         47        4.42       73.21
          S |         30        2.82       76.03
          T |         39        3.67       79.70
          U |         24        2.26       81.95
          V |         33        3.10       85.06
          W |         50        4.70       89.76
          X |         56        5.26       95.02
          Y |         36        3.38       98.40
          Z |         17        1.60      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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