Frequencies for pvin_2 variable in parkwork dataset :

        vin |
character(2 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          8        0.73        0.73
          1 |          2        0.18        0.92
          3 |          2        0.18        1.10
          4 |          1        0.09        1.19
          5 |          1        0.09        1.29
          6 |          1        0.09        1.38
          7 |          1        0.09        1.47
          8 |          1        0.09        1.56
          9 |         35        3.21        4.78
          A |         34        3.12        7.90
          B |         37        3.40       11.29
          C |         33        3.03       14.33
          D |         29        2.66       16.99
          F |        233       21.40       38.38
          G |        248       22.77       61.16
          H |         89        8.17       69.33
          J |         22        2.02       71.35
          K |          3        0.28       71.63
          L |          8        0.73       72.36
          M |         47        4.32       76.68
          N |         88        8.08       84.76
          P |          6        0.55       85.31
          R |          1        0.09       85.40
          S |          5        0.46       85.86
          T |         99        9.09       94.95
          U |          1        0.09       95.04
          V |         23        2.11       97.15
          X |         14        1.29       98.44
          Y |          9        0.83       99.27
          Z |          8        0.73      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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