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

        vin |
character(2 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         28        0.28        0.28
          1 |          9        0.09        0.37
          2 |         12        0.12        0.49
          3 |          4        0.04        0.53
          4 |          6        0.06        0.59
          5 |         12        0.12        0.71
          6 |          2        0.02        0.73
          7 |          5        0.05        0.78
          8 |         11        0.11        0.89
          9 |        387        3.87        4.76
          A |        192        1.92        6.68
          B |        431        4.31       10.99
          C |        212        2.12       13.11
          D |        287        2.87       15.98
          E |         12        0.12       16.10
          F |      1,581       15.81       31.91
          G |      1,833       18.33       50.24
          H |      1,314       13.14       63.38
          J |        214        2.14       65.52
          K |        141        1.41       66.93
          L |         88        0.88       67.81
          M |        356        3.56       71.37
          N |        843        8.43       79.80
          P |         42        0.42       80.22
          R |          4        0.04       80.26
          S |        228        2.28       82.54
          T |      1,026       10.26       92.80
          U |         25        0.25       93.05
          V |        216        2.16       95.21
          W |         12        0.12       95.33
          X |        173        1.73       97.06
          Y |        244        2.44       99.50
          Z |         50        0.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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