Frequencies for pvin_6 variable in parkwork dataset :

        VIN |
Character(6 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.10        0.10
          0 |         39        3.89        3.99
          1 |        234       23.35       27.35
          2 |        108       10.78       38.12
          3 |         84        8.38       46.51
          4 |         75        7.49       53.99
          5 |        155       15.47       69.46
          6 |         59        5.89       75.35
          7 |         46        4.59       79.94
          8 |         28        2.79       82.73
          9 |         61        6.09       88.82
          A |         33        3.29       92.12
          B |         20        2.00       94.11
          C |          6        0.60       94.71
          D |          6        0.60       95.31
          E |          5        0.50       95.81
          F |          2        0.20       96.01
          H |          1        0.10       96.11
          L |          4        0.40       96.51
          M |          1        0.10       96.61
          N |          2        0.20       96.81
          P |          1        0.10       96.91
          R |          2        0.20       97.11
          S |         15        1.50       98.60
          U |          2        0.20       98.80
          W |          3        0.30       99.10
          X |          2        0.20       99.30
          Y |          1        0.10       99.40
          Z |          6        0.60      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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