Frequencies for pvin_5 variable in parkwork dataset :

        vin |
character(5 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          2        0.18        0.18
          0 |          9        0.79        0.97
          1 |          3        0.26        1.24
          2 |          7        0.62        1.85
          3 |          3        0.26        2.12
          4 |          3        0.26        2.38
          5 |          3        0.26        2.65
          6 |          2        0.18        2.82
          7 |          5        0.44        3.27
          8 |          6        0.53        3.80
          9 |         26        2.29        6.09
          A |         69        6.09       12.18
          B |         56        4.94       17.12
          C |         90        7.94       25.07
          D |         82        7.24       32.30
          E |         34        3.00       35.30
          F |         75        6.62       41.92
          G |         46        4.06       45.98
          H |         25        2.21       48.19
          J |         27        2.38       50.57
          K |         63        5.56       56.13
          L |         54        4.77       60.90
          M |         44        3.88       64.78
          N |         30        2.65       67.43
          P |         77        6.80       74.23
          R |         38        3.35       77.58
          S |         45        3.97       81.55
          T |         29        2.56       84.11
          U |         69        6.09       90.20
          V |         12        1.06       91.26
          W |         47        4.15       95.41
          X |         30        2.65       98.06
          Y |         10        0.88       98.94
          Z |         12        1.06      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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