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

     vin_12 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        199        1.99        1.99
          0 |      1,620       16.20       18.19
          1 |      2,172       21.72       39.91
          2 |      1,190       11.90       51.81
          3 |        746        7.46       59.27
          4 |        420        4.20       63.47
          5 |        730        7.30       70.77
          6 |        520        5.20       75.97
          7 |        397        3.97       79.94
          8 |        250        2.50       82.44
          9 |        505        5.05       87.49
          A |        537        5.37       92.86
          B |        357        3.57       96.43
          C |        141        1.41       97.84
          D |         56        0.56       98.40
          E |         24        0.24       98.64
          F |         18        0.18       98.82
          G |         22        0.22       99.04
          H |         10        0.10       99.14
          I |          1        0.01       99.15
          J |         31        0.31       99.46
          K |          8        0.08       99.54
          L |          5        0.05       99.59
          M |         25        0.25       99.84
          P |          2        0.02       99.86
          R |          4        0.04       99.90
          S |          1        0.01       99.91
          T |          2        0.02       99.93
          U |          3        0.03       99.96
          V |          1        0.01       99.97
          W |          1        0.01       99.98
          Y |          1        0.01       99.99
          Z |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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