Frequencies for pvin_10 variable in parkwork dataset :

        VIN |
Characters( |
        10) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          4        0.40        0.40
          0 |          8        0.80        1.20
          1 |         67        6.69        7.88
          2 |         50        4.99       12.87
          3 |         47        4.69       17.56
          4 |         68        6.79       24.35
          5 |         51        5.09       29.44
          6 |         53        5.29       34.73
          7 |         61        6.09       40.82
          8 |         57        5.69       46.51
          9 |         74        7.39       53.89
          A |         36        3.59       57.49
          B |         34        3.39       60.88
          C |          6        0.60       61.48
          D |          1        0.10       61.58
          E |          4        0.40       61.98
          F |          3        0.30       62.28
          G |          1        0.10       62.38
          J |         10        1.00       63.37
          K |         10        1.00       64.37
          L |         15        1.50       65.87
          M |         11        1.10       66.97
          N |         15        1.50       68.46
          P |         27        2.69       71.16
          R |         27        2.69       73.85
          S |         32        3.19       77.05
          T |         35        3.49       80.54
          V |         38        3.79       84.33
          W |         46        4.59       88.92
          X |         47        4.69       93.61
          Y |         64        6.39      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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