Frequencies for pvin_10 variable in parkwork dataset :

        vin |
character(1 |
         0) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          4        0.37        0.37
          0 |          7        0.64        1.01
          1 |         71        6.52        7.53
          2 |         56        5.14       12.67
          3 |         46        4.22       16.90
          4 |         66        6.06       22.96
          5 |         57        5.23       28.19
          6 |         71        6.52       34.71
          7 |         66        6.06       40.77
          8 |         41        3.76       44.54
          9 |         61        5.60       50.14
          A |         34        3.12       53.26
          B |         53        4.87       58.13
          C |         60        5.51       63.64
          D |         54        4.96       68.60
          E |         47        4.32       72.91
          F |          7        0.64       73.55
          G |          6        0.55       74.10
          H |          8        0.73       74.84
          J |          9        0.83       75.67
          K |          9        0.83       76.49
          L |         10        0.92       77.41
          M |          9        0.83       78.24
          N |         12        1.10       79.34
          P |         14        1.29       80.62
          R |          9        0.83       81.45
          S |         25        2.30       83.75
          T |         10        0.92       84.66
          U |          1        0.09       84.76
          V |         25        2.30       87.05
          W |         34        3.12       90.17
          X |         50        4.59       94.77
          Y |         57        5.23      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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