Frequencies for first 10,000 rows of vin_6 variable in vehicle dataset :

      vin_6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         32        0.32        0.32
          0 |        756        7.56        7.88
          1 |      1,838       18.38       26.26
          2 |      1,039       10.39       36.65
          3 |        730        7.30       43.95
          4 |        648        6.48       50.43
          5 |        743        7.43       57.86
          6 |        765        7.65       65.51
          7 |        589        5.89       71.40
          8 |        561        5.61       77.01
          9 |        995        9.95       86.96
          A |        234        2.34       89.30
          B |         84        0.84       90.14
          C |         87        0.87       91.01
          D |         79        0.79       91.80
          E |         61        0.61       92.41
          F |         52        0.52       92.93
          G |         67        0.67       93.60
          H |        140        1.40       95.00
          J |         60        0.60       95.60
          K |         36        0.36       95.96
          L |         42        0.42       96.38
          M |         24        0.24       96.62
          N |         14        0.14       96.76
          P |         36        0.36       97.12
          Q |          7        0.07       97.19
          R |         26        0.26       97.45
          S |         55        0.55       98.00
          T |         36        0.36       98.36
          U |         28        0.28       98.64
          V |         15        0.15       98.79
          W |         13        0.13       98.92
          X |         20        0.20       99.12
          Y |         33        0.33       99.45
          Z |         55        0.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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