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

        vin |
character(6 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          2        0.02        0.02
          0 |        450        4.50        4.52
          1 |      2,328       23.28       27.80
          2 |      1,145       11.45       39.25
          3 |        876        8.76       48.01
          4 |        839        8.39       56.40
          5 |      1,382       13.82       70.22
          6 |        565        5.65       75.87
          7 |        508        5.08       80.95
          8 |        295        2.95       83.90
          9 |        525        5.25       89.15
          A |        142        1.42       90.57
          B |        183        1.83       92.40
          C |         81        0.81       93.21
          D |         50        0.50       93.71
          E |         38        0.38       94.09
          F |         26        0.26       94.35
          G |         35        0.35       94.70
          H |         40        0.40       95.10
          J |         41        0.41       95.51
          K |         26        0.26       95.77
          L |         35        0.35       96.12
          M |         52        0.52       96.64
          N |         14        0.14       96.78
          P |         28        0.28       97.06
          R |         56        0.56       97.62
          S |         74        0.74       98.36
          T |         13        0.13       98.49
          U |         21        0.21       98.70
          V |         33        0.33       99.03
          W |         28        0.28       99.31
          X |         28        0.28       99.59
          Y |         13        0.13       99.72
          Z |         28        0.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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