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

      vin_6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         37        0.37        0.37
          0 |      1,024       10.24       10.61
          1 |      1,528       15.28       25.89
          2 |        788        7.88       33.77
          3 |        623        6.23       40.00
          4 |        605        6.05       46.05
          5 |        645        6.45       52.50
          6 |        692        6.92       59.42
          7 |        630        6.30       65.72
          8 |        617        6.17       71.89
          9 |      1,244       12.44       84.33
          A |        292        2.92       87.25
          B |        118        1.18       88.43
          C |         92        0.92       89.35
          D |         96        0.96       90.31
          E |         70        0.70       91.01
          F |         94        0.94       91.95
          G |         60        0.60       92.55
          H |        155        1.55       94.10
          I |          2        0.02       94.12
          J |         53        0.53       94.65
          K |         41        0.41       95.06
          L |         64        0.64       95.70
          M |         26        0.26       95.96
          N |         22        0.22       96.18
          O |          3        0.03       96.21
          P |         64        0.64       96.85
          Q |         11        0.11       96.96
          R |         39        0.39       97.35
          S |         58        0.58       97.93
          T |         44        0.44       98.37
          U |         20        0.20       98.57
          V |         12        0.12       98.69
          W |         14        0.14       98.83
          X |         16        0.16       98.99
          Y |         30        0.30       99.29
          Z |         71        0.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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