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

      vin_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         13        0.13        0.13
          0 |        389        3.89        4.02
          1 |      1,029       10.29       14.31
          2 |      1,596       15.96       30.27
          3 |        972        9.72       39.99
          4 |      1,127       11.27       51.26
          5 |        734        7.34       58.60
          6 |      1,025       10.25       68.85
          7 |        394        3.94       72.79
          8 |        689        6.89       79.68
          9 |      1,184       11.84       91.52
          A |         90        0.90       92.42
          B |         70        0.70       93.12
          C |        118        1.18       94.30
          D |         34        0.34       94.64
          E |         49        0.49       95.13
          F |         17        0.17       95.30
          G |         23        0.23       95.53
          H |         23        0.23       95.76
          J |         22        0.22       95.98
          K |          7        0.07       96.05
          L |         49        0.49       96.54
          M |         39        0.39       96.93
          N |          1        0.01       96.94
          P |         41        0.41       97.35
          R |         18        0.18       97.53
          S |         11        0.11       97.64
          T |         23        0.23       97.87
          U |          5        0.05       97.92
          V |         28        0.28       98.20
          W |         58        0.58       98.78
          X |         13        0.13       98.91
          Y |         73        0.73       99.64
          Z |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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