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

      vin_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         36        0.36        0.36
          0 |        468        4.68        5.04
          1 |      1,305       13.05       18.09
          2 |      1,060       10.60       28.69
          3 |        709        7.09       35.78
          4 |      1,536       15.36       51.14
          5 |        845        8.45       59.59
          6 |        879        8.79       68.38
          7 |        485        4.85       73.23
          8 |        472        4.72       77.95
          9 |      1,140       11.40       89.35
          A |         74        0.74       90.09
          B |         29        0.29       90.38
          C |         65        0.65       91.03
          D |         31        0.31       91.34
          E |         49        0.49       91.83
          F |         36        0.36       92.19
          G |         37        0.37       92.56
          H |         41        0.41       92.97
          I |          1        0.01       92.98
          J |         42        0.42       93.40
          K |         21        0.21       93.61
          L |        102        1.02       94.63
          M |         21        0.21       94.84
          N |         12        0.12       94.96
          P |         31        0.31       95.27
          Q |         11        0.11       95.38
          R |         50        0.50       95.88
          S |         52        0.52       96.40
          T |         21        0.21       96.61
          U |         27        0.27       96.88
          V |         27        0.27       97.15
          W |         16        0.16       97.31
          X |         37        0.37       97.68
          Y |        135        1.35       99.03
          Z |         97        0.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016