Frequencies for pvin_11 variable in parkwork dataset :

        vin |
character(1 |
         1) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.26        0.26
          0 |         35        3.05        3.32
          1 |         26        2.27        5.58
          2 |         22        1.92        7.50
          3 |          7        0.61        8.12
          4 |         12        1.05        9.16
          5 |         21        1.83       10.99
          6 |         10        0.87       11.87
          7 |         27        2.36       14.22
          8 |          9        0.79       15.01
          9 |         65        5.67       20.68
          A |         49        4.28       24.96
          B |         38        3.32       28.27
          C |         66        5.76       34.03
          D |         43        3.75       37.78
          E |         56        4.89       42.67
          F |         39        3.40       46.07
          G |         37        3.23       49.30
          H |         76        6.63       55.93
          J |         44        3.84       59.77
          K |         29        2.53       62.30
          L |         77        6.72       69.02
          M |         31        2.71       71.73
          N |         43        3.75       75.48
          P |         16        1.40       76.88
          R |         37        3.23       80.10
          S |         42        3.66       83.77
          T |         18        1.57       85.34
          U |         67        5.85       91.19
          V |          6        0.52       91.71
          W |         20        1.75       93.46
          X |         24        2.09       95.55
          Y |         12        1.05       96.60
          Z |         39        3.40      100.00
------------+-----------------------------------
      Total |      1,146      100.00

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