Frequencies for pvin_10 variable in parkwork dataset :

        vin |
character(1 |
         0) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          5        0.44        0.44
          0 |          9        0.79        1.24
          1 |         58        5.12        6.35
          2 |         54        4.77       11.12
          3 |         66        5.83       16.95
          4 |         70        6.18       23.12
          5 |         70        6.18       29.30
          6 |         76        6.71       36.01
          7 |         71        6.27       42.28
          8 |         42        3.71       45.98
          9 |         62        5.47       51.46
          A |         42        3.71       55.16
          B |         38        3.35       58.52
          C |         42        3.71       62.22
          D |         58        5.12       67.34
          E |         48        4.24       71.58
          F |         58        5.12       76.70
          G |         19        1.68       78.38
          H |          3        0.26       78.64
          J |          3        0.26       78.91
          K |          6        0.53       79.44
          L |          4        0.35       79.79
          M |          7        0.62       80.41
          N |          6        0.53       80.94
          P |         12        1.06       81.99
          R |          8        0.71       82.70
          S |         18        1.59       84.29
          T |         18        1.59       85.88
          V |         26        2.29       88.17
          W |         39        3.44       91.62
          X |         46        4.06       95.68
          Y |         49        4.32      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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