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

      vin_6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         32        0.32        0.32
          0 |        993        9.93       10.25
          1 |      1,607       16.07       26.32
          2 |        931        9.31       35.63
          3 |        738        7.38       43.01
          4 |        645        6.45       49.46
          5 |        623        6.23       55.69
          6 |        772        7.72       63.41
          7 |        592        5.92       69.33
          8 |        614        6.14       75.47
          9 |        937        9.37       84.84
          A |        290        2.90       87.74
          B |        106        1.06       88.80
          C |        102        1.02       89.82
          D |         96        0.96       90.78
          E |         75        0.75       91.53
          F |         83        0.83       92.36
          G |         46        0.46       92.82
          H |        147        1.47       94.29
          J |         59        0.59       94.88
          K |         44        0.44       95.32
          L |         67        0.67       95.99
          M |         29        0.29       96.28
          N |         26        0.26       96.54
          O |          1        0.01       96.55
          P |         43        0.43       96.98
          Q |          8        0.08       97.06
          R |         30        0.30       97.36
          S |         63        0.63       97.99
          T |         47        0.47       98.46
          U |         19        0.19       98.65
          V |         17        0.17       98.82
          W |         10        0.10       98.92
          X |         17        0.17       99.09
          Y |         27        0.27       99.36
          Z |         64        0.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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