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

        vin |
character(7 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          4        0.04        0.04
          0 |        357        3.57        3.61
          1 |        865        8.65       12.26
          2 |      1,392       13.92       26.18
          3 |      1,000       10.00       36.18
          4 |        894        8.94       45.12
          5 |        638        6.38       51.50
          6 |        976        9.76       61.26
          7 |        405        4.05       65.31
          8 |        858        8.58       73.89
          9 |        906        9.06       82.95
          A |        220        2.20       85.15
          B |        128        1.28       86.43
          C |        202        2.02       88.45
          D |        142        1.42       89.87
          E |        268        2.68       92.55
          F |         97        0.97       93.52
          G |         55        0.55       94.07
          H |         83        0.83       94.90
          J |         66        0.66       95.56
          K |         39        0.39       95.95
          L |         60        0.60       96.55
          M |         63        0.63       97.18
          N |          7        0.07       97.25
          P |         65        0.65       97.90
          R |         17        0.17       98.07
          S |         20        0.20       98.27
          T |         22        0.22       98.49
          U |          3        0.03       98.52
          V |         31        0.31       98.83
          W |         62        0.62       99.45
          X |          2        0.02       99.47
          Y |         37        0.37       99.84
          Z |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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