Frequencies for pvin_12 variable in parkwork dataset :

        vin |
character(1 |
         2) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          5        0.44        0.44
          0 |        163       14.22       14.66
          1 |        223       19.46       34.12
          2 |        147       12.83       46.95
          3 |         68        5.93       52.88
          4 |         48        4.19       57.07
          5 |         91        7.94       65.01
          6 |         72        6.28       71.29
          7 |         33        2.88       74.17
          8 |         22        1.92       76.09
          9 |         68        5.93       82.02
          A |         80        6.98       89.01
          B |         53        4.62       93.63
          C |          8        0.70       94.33
          D |         12        1.05       95.38
          E |          6        0.52       95.90
          F |          6        0.52       96.42
          G |          2        0.17       96.60
          H |          1        0.09       96.68
          J |         12        1.05       97.73
          K |          1        0.09       97.82
          L |          2        0.17       97.99
          M |          5        0.44       98.43
          N |          2        0.17       98.60
          O |          1        0.09       98.69
          R |          1        0.09       98.78
          S |          1        0.09       98.87
          T |          1        0.09       98.95
          U |          4        0.35       99.30
          V |          3        0.26       99.56
          W |          1        0.09       99.65
          Y |          3        0.26       99.91
          Z |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,146      100.00

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