Frequencies for first 10,000 rows of vin_3 variable in vehicle dataset :

      vin_3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.01        0.01
          0 |        758        7.58        7.59
          1 |        871        8.71       16.30
          2 |        977        9.77       26.07
          3 |        726        7.26       33.33
          4 |      1,236       12.36       45.69
          5 |        837        8.37       54.06
          6 |        933        9.33       63.39
          7 |        429        4.29       67.68
          8 |        585        5.85       73.53
          9 |      1,201       12.01       85.54
          A |        110        1.10       86.64
          B |         86        0.86       87.50
          C |         74        0.74       88.24
          D |         65        0.65       88.89
          E |        138        1.38       90.27
          F |        106        1.06       91.33
          G |         26        0.26       91.59
          H |         22        0.22       91.81
          I |          4        0.04       91.85
          J |          6        0.06       91.91
          K |          8        0.08       91.99
          L |        257        2.57       94.56
          M |         16        0.16       94.72
          N |         67        0.67       95.39
          O |          7        0.07       95.46
          P |          9        0.09       95.55
          Q |         13        0.13       95.68
          R |         35        0.35       96.03
          S |         88        0.88       96.91
          T |         72        0.72       97.63
          U |         30        0.30       97.93
          V |         47        0.47       98.40
          W |          4        0.04       98.44
          X |         14        0.14       98.58
          Y |        119        1.19       99.77
          Z |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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