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

        vin |
character(7 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          4        0.04        0.04
          . |          2        0.02        0.06
          0 |        411        4.11        4.17
          1 |        837        8.37       12.54
          2 |      1,262       12.62       25.16
          3 |        978        9.78       34.94
          4 |        844        8.44       43.38
          5 |        530        5.30       48.68
          6 |        932        9.32       58.00
          7 |        377        3.77       61.77
          8 |        810        8.10       69.87
          9 |        934        9.34       79.21
          A |        302        3.02       82.23
          B |        156        1.56       83.79
          C |        214        2.14       85.93
          D |        192        1.92       87.85
          E |        335        3.35       91.20
          F |        161        1.61       92.81
          G |         50        0.50       93.31
          H |         92        0.92       94.23
          J |         67        0.67       94.90
          K |         37        0.37       95.27
          L |         51        0.51       95.78
          M |         89        0.89       96.67
          N |         11        0.11       96.78
          P |         74        0.74       97.52
          Q |          1        0.01       97.53
          R |         24        0.24       97.77
          S |         38        0.38       98.15
          T |         27        0.27       98.42
          U |          1        0.01       98.43
          V |         29        0.29       98.72
          W |         66        0.66       99.38
          X |          4        0.04       99.42
          Y |         42        0.42       99.84
          Z |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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