Frequencies for first 10,000 rows of vin_9 variable in vehicle dataset :

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        107        1.07        1.07
          0 |        928        9.28       10.35
          1 |        932        9.32       19.67
          2 |        886        8.86       28.53
          3 |        859        8.59       37.12
          4 |        849        8.49       45.61
          5 |        886        8.86       54.47
          6 |        883        8.83       63.30
          7 |        841        8.41       71.71
          8 |        851        8.51       80.22
          9 |      1,199       11.99       92.21
          A |          6        0.06       92.27
          B |          4        0.04       92.31
          C |          9        0.09       92.40
          D |         10        0.10       92.50
          E |          2        0.02       92.52
          F |          3        0.03       92.55
          G |          3        0.03       92.58
          H |          2        0.02       92.60
          I |          4        0.04       92.64
          K |          1        0.01       92.65
          L |          6        0.06       92.71
          M |          3        0.03       92.74
          N |          1        0.01       92.75
          O |          7        0.07       92.82
          P |          4        0.04       92.86
          Q |          1        0.01       92.87
          R |          2        0.02       92.89
          S |         10        0.10       92.99
          T |          1        0.01       93.00
          U |          2        0.02       93.02
          X |        681        6.81       99.83
          Y |          4        0.04       99.87
          Z |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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