Frequencies for pvin_7 variable in parkwork dataset :

        VIN |
Character(7 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          2        0.19        0.19
          0 |         37        3.48        3.67
          1 |        106        9.96       13.63
          2 |        151       14.19       27.82
          3 |         93        8.74       36.56
          4 |        112       10.53       47.09
          5 |         73        6.86       53.95
          6 |        112       10.53       64.47
          7 |         45        4.23       68.70
          8 |        109       10.24       78.95
          9 |        100        9.40       88.35
          A |         20        1.88       90.23
          B |          9        0.85       91.07
          C |         28        2.63       93.70
          D |         12        1.13       94.83
          E |         19        1.79       96.62
          F |          4        0.38       96.99
          G |          2        0.19       97.18
          H |          5        0.47       97.65
          J |          4        0.38       98.03
          M |          3        0.28       98.31
          P |          6        0.56       98.87
          R |          1        0.09       98.97
          S |          1        0.09       99.06
          T |          3        0.28       99.34
          V |          1        0.09       99.44
          W |          2        0.19       99.62
          Y |          2        0.19       99.81
          Z |          2        0.19      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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