Frequencies for pvin_7 variable in parkwork dataset :

        vin |
character(7 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.09        0.09
          0 |         46        4.22        4.32
          1 |         92        8.45       12.76
          2 |        102        9.37       22.13
          3 |         90        8.26       30.39
          4 |         83        7.62       38.02
          5 |         61        5.60       43.62
          6 |        100        9.18       52.80
          7 |         40        3.67       56.47
          8 |         74        6.80       63.27
          9 |         85        7.81       71.07
          A |         60        5.51       76.58
          B |         24        2.20       78.79
          C |         39        3.58       82.37
          D |         36        3.31       85.67
          E |         40        3.67       89.35
          F |         25        2.30       91.64
          G |         12        1.10       92.75
          H |         15        1.38       94.12
          J |         16        1.47       95.59
          K |          8        0.73       96.33
          L |          2        0.18       96.51
          M |          9        0.83       97.34
          P |          6        0.55       97.89
          R |          4        0.37       98.26
          S |          8        0.73       98.99
          T |          5        0.46       99.45
          V |          2        0.18       99.63
          Y |          1        0.09       99.72
          Z |          3        0.28      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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