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

      vin_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          9        0.09        0.09
          0 |        404        4.04        4.13
          1 |        997        9.97       14.10
          2 |      1,592       15.92       30.02
          3 |        966        9.66       39.68
          4 |      1,063       10.63       50.31
          5 |        703        7.03       57.34
          6 |      1,033       10.33       67.67
          7 |        437        4.37       72.04
          8 |        746        7.46       79.50
          9 |      1,119       11.19       90.69
          A |         85        0.85       91.54
          B |         79        0.79       92.33
          C |        127        1.27       93.60
          D |         63        0.63       94.23
          E |         50        0.50       94.73
          F |         24        0.24       94.97
          G |         24        0.24       95.21
          H |         30        0.30       95.51
          J |         29        0.29       95.80
          K |         11        0.11       95.91
          L |         65        0.65       96.56
          M |         36        0.36       96.92
          N |          3        0.03       96.95
          P |         56        0.56       97.51
          Q |          1        0.01       97.52
          R |         20        0.20       97.72
          S |          6        0.06       97.78
          T |         22        0.22       98.00
          U |          6        0.06       98.06
          V |         24        0.24       98.30
          W |         62        0.62       98.92
          X |         11        0.11       99.03
          Y |         75        0.75       99.78
          Z |         22        0.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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