Frequencies for first 10,000 rows of vin_12 variable in vehicle dataset :

     vin_12 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        155        1.55        1.55
          0 |      1,655       16.55       18.10
          1 |      2,120       21.20       39.30
          2 |      1,227       12.27       51.57
          3 |        748        7.48       59.05
          4 |        395        3.95       63.00
          5 |        777        7.77       70.77
          6 |        529        5.29       76.06
          7 |        364        3.64       79.70
          8 |        224        2.24       81.94
          9 |        500        5.00       86.94
          A |        535        5.35       92.29
          B |        402        4.02       96.31
          C |        131        1.31       97.62
          D |         58        0.58       98.20
          E |         21        0.21       98.41
          F |         23        0.23       98.64
          G |         12        0.12       98.76
          H |         14        0.14       98.90
          J |         42        0.42       99.32
          K |         14        0.14       99.46
          L |         11        0.11       99.57
          M |         22        0.22       99.79
          N |          2        0.02       99.81
          O |          1        0.01       99.82
          P |          2        0.02       99.84
          R |          2        0.02       99.86
          S |          2        0.02       99.88
          U |          2        0.02       99.90
          V |          4        0.04       99.94
          W |          4        0.04       99.98
          Y |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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