Frequencies for pvin_6 variable in parkwork dataset :

        vin |
character(6 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         45        4.15        4.15
          1 |        236       21.77       25.92
          2 |        116       10.70       36.62
          3 |        120       11.07       47.69
          4 |         93        8.58       56.27
          5 |        137       12.64       68.91
          6 |         70        6.46       75.37
          7 |         45        4.15       79.52
          8 |         36        3.32       82.84
          9 |         38        3.51       86.35
          A |         33        3.04       89.39
          B |         18        1.66       91.05
          C |          9        0.83       91.88
          E |          2        0.18       92.07
          F |         11        1.01       93.08
          G |          5        0.46       93.54
          H |          5        0.46       94.00
          J |          1        0.09       94.10
          K |          1        0.09       94.19
          L |          9        0.83       95.02
          N |          1        0.09       95.11
          P |          3        0.28       95.39
          R |          3        0.28       95.66
          S |         13        1.20       96.86
          T |          6        0.55       97.42
          U |          3        0.28       97.69
          V |          4        0.37       98.06
          W |          8        0.74       98.80
          X |          6        0.55       99.35
          Y |          1        0.09       99.45
          Z |          6        0.55      100.00
------------+-----------------------------------
      Total |      1,084      100.00

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