Frequencies for first 10,000 rows of vin_7 variable in vehicle dataset :

      vin_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.01        0.01
          0 |        378        3.78        3.79
          1 |        979        9.79       13.58
          2 |      1,565       15.65       29.23
          3 |      1,084       10.84       40.07
          4 |      1,008       10.08       50.15
          5 |        720        7.20       57.35
          6 |      1,035       10.35       67.70
          7 |        435        4.35       72.05
          8 |        827        8.27       80.32
          9 |      1,018       10.18       90.50
          A |        100        1.00       91.50
          B |         75        0.75       92.25
          C |        148        1.48       93.73
          D |         63        0.63       94.36
          E |         69        0.69       95.05
          F |         20        0.20       95.25
          G |         20        0.20       95.45
          H |         19        0.19       95.64
          J |         26        0.26       95.90
          K |         15        0.15       96.05
          L |         49        0.49       96.54
          M |         36        0.36       96.90
          N |          9        0.09       96.99
          P |         61        0.61       97.60
          Q |          1        0.01       97.61
          R |         16        0.16       97.77
          S |          6        0.06       97.83
          T |         21        0.21       98.04
          U |          4        0.04       98.08
          V |         32        0.32       98.40
          W |         68        0.68       99.08
          X |          9        0.09       99.17
          Y |         63        0.63       99.80
          Z |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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