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

      vin_6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         99        0.99        0.99
          0 |      1,470       14.70       15.69
          1 |      1,418       14.18       29.87
          2 |        751        7.51       37.38
          3 |        575        5.75       43.13
          4 |        490        4.90       48.03
          5 |        735        7.35       55.38
          6 |        530        5.30       60.68
          7 |        373        3.73       64.41
          8 |        405        4.05       68.46
          9 |      1,860       18.60       87.06
          A |         78        0.78       87.84
          B |         56        0.56       88.40
          C |         50        0.50       88.90
          D |         64        0.64       89.54
          E |         43        0.43       89.97
          F |         86        0.86       90.83
          G |         34        0.34       91.17
          H |         96        0.96       92.13
          J |         35        0.35       92.48
          K |         52        0.52       93.00
          L |        110        1.10       94.10
          M |         22        0.22       94.32
          N |         39        0.39       94.71
          O |         13        0.13       94.84
          P |         67        0.67       95.51
          Q |         16        0.16       95.67
          R |         52        0.52       96.19
          S |         80        0.80       96.99
          T |         80        0.80       97.79
          U |         49        0.49       98.28
          V |         31        0.31       98.59
          W |         24        0.24       98.83
          X |         20        0.20       99.03
          Y |         10        0.10       99.13
          Z |         87        0.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016