Frequencies for pvin_12 variable in parkwork dataset :

        vin |
character(1 |
         2) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          7        0.62        0.62
          0 |        155       13.68       14.30
          1 |        207       18.27       32.57
          2 |        151       13.33       45.90
          3 |         85        7.50       53.40
          4 |         60        5.30       58.69
          5 |         93        8.21       66.90
          6 |         64        5.65       72.55
          7 |         54        4.77       77.32
          8 |         30        2.65       79.96
          9 |         35        3.09       83.05
          A |         55        4.85       87.91
          B |         52        4.59       92.50
          C |         14        1.24       93.73
          D |         10        0.88       94.62
          E |          2        0.18       94.79
          F |          7        0.62       95.41
          G |          7        0.62       96.03
          H |          6        0.53       96.56
          J |          6        0.53       97.09
          K |          3        0.26       97.35
          L |          1        0.09       97.44
          M |          7        0.62       98.06
          N |          3        0.26       98.32
          P |          1        0.09       98.41
          R |          1        0.09       98.50
          S |          2        0.18       98.68
          U |          3        0.26       98.94
          V |          4        0.35       99.29
          W |          1        0.09       99.38
          X |          4        0.35       99.74
          Y |          2        0.18       99.91
          Z |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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