Frequencies for pvin_10 variable in parkwork dataset :

        vin |
character(1 |
         0) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          4        0.37        0.37
          0 |          7        0.65        1.01
          1 |         71        6.55        7.56
          2 |         56        5.17       12.73
          3 |         46        4.24       16.97
          4 |         66        6.09       23.06
          5 |         57        5.26       28.32
          6 |         71        6.55       34.87
          7 |         66        6.09       40.96
          8 |         41        3.78       44.74
          9 |         60        5.54       50.28
          A |         34        3.14       53.41
          B |         53        4.89       58.30
          C |         60        5.54       63.84
          D |         53        4.89       68.73
          E |         46        4.24       72.97
          F |          7        0.65       73.62
          G |          6        0.55       74.17
          H |          8        0.74       74.91
          J |          9        0.83       75.74
          K |          9        0.83       76.57
          L |         10        0.92       77.49
          M |          9        0.83       78.32
          N |         12        1.11       79.43
          P |         14        1.29       80.72
          R |          9        0.83       81.55
          S |         25        2.31       83.86
          T |         10        0.92       84.78
          U |          1        0.09       84.87
          V |         25        2.31       87.18
          W |         34        3.14       90.31
          X |         49        4.52       94.83
          Y |         56        5.17      100.00
------------+-----------------------------------
      Total |      1,084      100.00

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