Frequencies for pvin_5 variable in parkwork dataset :

        VIN |
Character(5 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          2        0.19        0.19
          0 |          8        0.75        0.94
          1 |          3        0.28        1.22
          2 |          2        0.19        1.41
          3 |          2        0.19        1.60
          4 |          3        0.28        1.88
          5 |          6        0.56        2.44
          6 |          1        0.09        2.54
          7 |          4        0.38        2.91
          8 |          2        0.19        3.10
          9 |         35        3.29        6.39
          A |         76        7.14       13.53
          B |         38        3.57       17.11
          C |         64        6.02       23.12
          D |         63        5.92       29.04
          E |         47        4.42       33.46
          F |         86        8.08       41.54
          G |         45        4.23       45.77
          H |         26        2.44       48.21
          J |         21        1.97       50.19
          K |         71        6.67       56.86
          L |         52        4.89       61.75
          M |         41        3.85       65.60
          N |         31        2.91       68.52
          P |         70        6.58       75.09
          R |         40        3.76       78.85
          S |         43        4.04       82.89
          T |         30        2.82       85.71
          U |         55        5.17       90.88
          V |         14        1.32       92.20
          W |         38        3.57       95.77
          X |         28        2.63       98.40
          Y |          9        0.85       99.25
          Z |          8        0.75      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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