Frequencies for pvin_2 variable in parkwork dataset :

        VIN |
Character(2 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.10        0.10
          0 |          7        0.70        0.80
          1 |          3        0.30        1.10
          2 |          1        0.10        1.20
          3 |          3        0.30        1.50
          4 |          1        0.10        1.60
          5 |          1        0.10        1.70
          8 |          2        0.20        1.90
          9 |         48        4.79        6.69
          A |         15        1.50        8.18
          B |         51        5.09       13.27
          C |         17        1.70       14.97
          D |         31        3.09       18.06
          E |          3        0.30       18.36
          F |        212       21.16       39.52
          G |        223       22.26       61.78
          H |         96        9.58       71.36
          J |         25        2.50       73.85
          K |          4        0.40       74.25
          L |         11        1.10       75.35
          M |         28        2.79       78.14
          N |         73        7.29       85.43
          P |          9        0.90       86.33
          S |          4        0.40       86.73
          T |         78        7.78       94.51
          U |          2        0.20       94.71
          V |         16        1.60       96.31
          W |          5        0.50       96.81
          X |         19        1.90       98.70
          Y |         10        1.00       99.70
          Z |          3        0.30      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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