Frequencies for pvin_12 variable in parkwork dataset :

        vin |
character(1 |
         2) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          6        0.55        0.55
          0 |        149       13.66       14.21
          1 |        208       19.07       33.27
          2 |        153       14.02       47.30
          3 |         82        7.52       54.81
          4 |         40        3.67       58.48
          5 |         94        8.62       67.09
          6 |         56        5.13       72.23
          7 |         26        2.38       74.61
          8 |         27        2.47       77.09
          9 |         54        4.95       82.03
          A |         70        6.42       88.45
          B |         48        4.40       92.85
          C |         15        1.37       94.23
          D |         12        1.10       95.33
          E |          3        0.27       95.60
          F |          1        0.09       95.69
          G |          1        0.09       95.78
          H |          1        0.09       95.88
          J |          9        0.82       96.70
          K |          3        0.27       96.98
          M |          8        0.73       97.71
          N |          2        0.18       97.89
          O |          1        0.09       97.98
          P |          2        0.18       98.17
          S |          3        0.27       98.44
          T |          1        0.09       98.53
          U |          2        0.18       98.72
          V |          5        0.46       99.18
          W |          3        0.27       99.45
          X |          1        0.09       99.54
          Y |          2        0.18       99.73
          Z |          3        0.27      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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