Frequencies for first 10,000 rows of vin_7 variable in vehicle dataset :

      vin_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        187        1.87        1.87
          0 |        954        9.54       11.41
          1 |        813        8.13       19.54
          2 |        628        6.28       25.82
          3 |        471        4.71       30.53
          4 |        435        4.35       34.88
          5 |        477        4.77       39.65
          6 |        384        3.84       43.49
          7 |        331        3.31       46.80
          8 |        411        4.11       50.91
          9 |      1,204       12.04       62.95
          A |        213        2.13       65.08
          B |        154        1.54       66.62
          C |        318        3.18       69.80
          D |        171        1.71       71.51
          E |        109        1.09       72.60
          F |        102        1.02       73.62
          G |        182        1.82       75.44
          H |        170        1.70       77.14
          I |          1        0.01       77.15
          J |         64        0.64       77.79
          K |         75        0.75       78.54
          L |        340        3.40       81.94
          M |         94        0.94       82.88
          N |        102        1.02       83.90
          O |          1        0.01       83.91
          P |        146        1.46       85.37
          Q |         78        0.78       86.15
          R |        168        1.68       87.83
          S |        189        1.89       89.72
          T |         27        0.27       89.99
          U |        123        1.23       91.22
          V |         95        0.95       92.17
          W |         88        0.88       93.05
          X |        119        1.19       94.24
          Y |         57        0.57       94.81
          Z |        519        5.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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