Frequencies for pvin_11 variable in parkwork dataset :

        vin |
character(1 |
         1) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          4        0.37        0.37
          0 |         43        3.95        4.32
          1 |         46        4.22        8.54
          2 |         30        2.75       11.29
          3 |          8        0.73       12.03
          4 |         13        1.19       13.22
          5 |         27        2.48       15.70
          6 |         19        1.74       17.45
          7 |         22        2.02       19.47
          8 |          6        0.55       20.02
          9 |         44        4.04       24.06
          A |         47        4.32       28.37
          B |         33        3.03       31.40
          C |         70        6.43       37.83
          D |         32        2.94       40.77
          E |         67        6.15       46.92
          F |         34        3.12       50.05
          G |         27        2.48       52.53
          H |         64        5.88       58.40
          J |         50        4.59       62.99
          K |         20        1.84       64.83
          L |         53        4.87       69.70
          M |         33        3.03       72.73
          N |         51        4.68       77.41
          P |         16        1.47       78.88
          R |         41        3.76       82.64
          S |         32        2.94       85.58
          T |         18        1.65       87.24
          U |         53        4.87       92.10
          V |          8        0.73       92.84
          W |         32        2.94       95.78
          X |         10        0.92       96.69
          Y |          6        0.55       97.25
          Z |         30        2.75      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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