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

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         96        0.96        0.96
          0 |        883        8.83        9.79
          1 |        929        9.29       19.08
          2 |        897        8.97       28.05
          3 |        850        8.50       36.55
          4 |        869        8.69       45.24
          5 |        839        8.39       53.63
          6 |        833        8.33       61.96
          7 |        878        8.78       70.74
          8 |        836        8.36       79.10
          9 |      1,247       12.47       91.57
          A |          7        0.07       91.64
          B |          4        0.04       91.68
          C |          2        0.02       91.70
          D |          8        0.08       91.78
          E |          1        0.01       91.79
          F |          1        0.01       91.80
          G |          1        0.01       91.81
          H |          1        0.01       91.82
          I |          2        0.02       91.84
          J |          1        0.01       91.85
          L |          2        0.02       91.87
          N |          2        0.02       91.89
          O |         36        0.36       92.25
          P |          2        0.02       92.27
          R |          1        0.01       92.28
          S |          9        0.09       92.37
          T |          1        0.01       92.38
          U |          1        0.01       92.39
          W |          1        0.01       92.40
          X |        753        7.53       99.93
          Y |          3        0.03       99.96
          Z |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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