Frequencies for pvin_10 variable in parkwork dataset :

        VIN |
Characters( |
        10) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          5        0.47        0.47
          0 |          9        0.85        1.32
          1 |         57        5.36        6.67
          2 |         61        5.73       12.41
          3 |         74        6.95       19.36
          4 |         54        5.08       24.44
          5 |         63        5.92       30.36
          6 |         58        5.45       35.81
          7 |         65        6.11       41.92
          8 |         52        4.89       46.80
          9 |         68        6.39       53.20
          A |         35        3.29       56.48
          B |          6        0.56       57.05
          C |          3        0.28       57.33
          D |          3        0.28       57.61
          E |          3        0.28       57.89
          F |          1        0.09       57.99
          G |         11        1.03       59.02
          H |         11        1.03       60.06
          J |          7        0.66       60.71
          K |         14        1.32       62.03
          L |          8        0.75       62.78
          M |         12        1.13       63.91
          N |         16        1.50       65.41
          P |         19        1.79       67.20
          R |         37        3.48       70.68
          S |         46        4.32       75.00
          T |         40        3.76       78.76
          V |         50        4.70       83.46
          W |         47        4.42       87.88
          X |         58        5.45       93.33
          Y |         71        6.67      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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