Frequencies for pvin_5 variable in parkwork dataset :

        vin |
character(5 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         14        1.22        1.22
          1 |          7        0.61        1.83
          2 |          3        0.26        2.09
          3 |          3        0.26        2.36
          4 |          6        0.52        2.88
          5 |          5        0.44        3.32
          6 |          1        0.09        3.40
          7 |          7        0.61        4.01
          8 |          1        0.09        4.10
          9 |         53        4.62        8.73
          A |         49        4.28       13.00
          B |         53        4.62       17.63
          C |         86        7.50       25.13
          D |         80        6.98       32.11
          E |         48        4.19       36.30
          F |         76        6.63       42.93
          G |         49        4.28       47.21
          H |         19        1.66       48.87
          J |         36        3.14       52.01
          K |         47        4.10       56.11
          L |         48        4.19       60.30
          M |         42        3.66       63.96
          N |         26        2.27       66.23
          P |         93        8.12       74.35
          R |         38        3.32       77.66
          S |         35        3.05       80.72
          T |         39        3.40       84.12
          U |         70        6.11       90.23
          V |         17        1.48       91.71
          W |         27        2.36       94.07
          X |         40        3.49       97.56
          Y |         17        1.48       99.04
          Z |         11        0.96      100.00
------------+-----------------------------------
      Total |      1,146      100.00

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