Frequencies for pvin_11 variable in parkwork dataset :

        vin |
character(1 |
         1) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          5        0.46        0.46
          0 |         39        3.57        4.03
          1 |         41        3.76        7.79
          2 |         16        1.47        9.26
          3 |          7        0.64        9.90
          4 |         16        1.47       11.37
          5 |         30        2.75       14.12
          6 |         21        1.92       16.04
          7 |         21        1.92       17.97
          8 |         13        1.19       19.16
          9 |         55        5.04       24.20
          A |         55        5.04       29.24
          B |         33        3.02       32.26
          C |         58        5.32       37.58
          D |         38        3.48       41.06
          E |         58        5.32       46.38
          F |         49        4.49       50.87
          G |         37        3.39       54.26
          H |         66        6.05       60.31
          J |         28        2.57       62.88
          K |         26        2.38       65.26
          L |         48        4.40       69.66
          M |         22        2.02       71.68
          N |         44        4.03       75.71
          P |         19        1.74       77.45
          R |         26        2.38       79.84
          S |         33        3.02       82.86
          T |         34        3.12       85.98
          U |         49        4.49       90.47
          V |          6        0.55       91.02
          W |         33        3.02       94.04
          X |         16        1.47       95.51
          Y |         10        0.92       96.43
          Z |         39        3.57      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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