Frequencies for first 10,000 rows of vin_2 variable in vehicle dataset :

      vin_2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         52        0.52        0.52
          1 |        269        2.69        3.21
          2 |        149        1.49        4.70
          3 |         87        0.87        5.57
          4 |         33        0.33        5.90
          5 |         44        0.44        6.34
          6 |         55        0.55        6.89
          7 |         38        0.38        7.27
          8 |         50        0.50        7.77
          9 |        358        3.58       11.35
          A |        251        2.51       13.86
          B |        425        4.25       18.11
          C |        280        2.80       20.91
          D |        101        1.01       21.92
          E |        133        1.33       23.25
          F |      1,390       13.90       37.15
          G |      2,007       20.07       57.22
          H |        752        7.52       64.74
          J |        182        1.82       66.56
          K |        185        1.85       68.41
          L |        221        2.21       70.62
          M |        525        5.25       75.87
          N |        626        6.26       82.13
          P |        165        1.65       83.78
          Q |         28        0.28       84.06
          R |         80        0.80       84.86
          S |        195        1.95       86.81
          T |        664        6.64       93.45
          U |          9        0.09       93.54
          V |        119        1.19       94.73
          W |         78        0.78       95.51
          X |        213        2.13       97.64
          Y |        147        1.47       99.11
          Z |         89        0.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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