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

      vin_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        156        1.56        1.56
           |          2        0.02        1.58
          0 |        836        8.36        9.94
          1 |        871        8.71       18.65
          2 |        628        6.28       24.93
          3 |        485        4.85       29.78
          4 |        611        6.11       35.89
          5 |        537        5.37       41.26
          6 |        445        4.45       45.71
          7 |        476        4.76       50.47
          8 |        487        4.87       55.34
          9 |      1,085       10.85       66.19
          A |        218        2.18       68.37
          B |        142        1.42       69.79
          C |        244        2.44       72.23
          D |        142        1.42       73.65
          E |        111        1.11       74.76
          F |        114        1.14       75.90
          G |        176        1.76       77.66
          H |        158        1.58       79.24
          I |          2        0.02       79.26
          J |         88        0.88       80.14
          K |         87        0.87       81.01
          L |        253        2.53       83.54
          M |        106        1.06       84.60
          N |        112        1.12       85.72
          P |        120        1.20       86.92
          Q |         70        0.70       87.62
          R |        163        1.63       89.25
          S |        192        1.92       91.17
          T |         39        0.39       91.56
          U |        102        1.02       92.58
          V |         76        0.76       93.34
          W |         89        0.89       94.23
          X |        107        1.07       95.30
          Y |         68        0.68       95.98
          Z |        402        4.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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