Frequencies for pvin_11 variable in parkwork dataset :

        VIN |
Character(1 |
         1) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          4        0.40        0.40
          0 |         41        4.09        4.49
          1 |         39        3.89        8.38
          2 |         13        1.30        9.68
          3 |          4        0.40       10.08
          4 |          9        0.90       10.98
          5 |         20        2.00       12.97
          6 |         12        1.20       14.17
          7 |         24        2.40       16.57
          8 |         11        1.10       17.66
          9 |         66        6.59       24.25
          A |         42        4.19       28.44
          B |         23        2.30       30.74
          C |         58        5.79       36.53
          D |         32        3.19       39.72
          E |         34        3.39       43.11
          F |         39        3.89       47.01
          G |         19        1.90       48.90
          H |         74        7.39       56.29
          J |         37        3.69       59.98
          K |         32        3.19       63.17
          L |         52        5.19       68.36
          M |         19        1.90       70.26
          N |         40        3.99       74.25
          P |         19        1.90       76.15
          R |         34        3.39       79.54
          S |         37        3.69       83.23
          T |          8        0.80       84.03
          U |         55        5.49       89.52
          V |          5        0.50       90.02
          W |         23        2.30       92.32
          X |         18        1.80       94.11
          Y |         15        1.50       95.61
          Z |         44        4.39      100.00
------------+-----------------------------------
      Total |      1,002      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016