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

      vin_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        107        1.07        1.07
          0 |        783        7.83        8.90
          1 |        869        8.69       17.59
          2 |        663        6.63       24.22
          3 |        555        5.55       29.77
          4 |        958        9.58       39.35
          5 |        666        6.66       46.01
          6 |        519        5.19       51.20
          7 |        681        6.81       58.01
          8 |        549        5.49       63.50
          9 |      1,085       10.85       74.35
          A |        220        2.20       76.55
          B |         81        0.81       77.36
          C |        140        1.40       78.76
          D |        108        1.08       79.84
          E |         87        0.87       80.71
          F |         83        0.83       81.54
          G |        130        1.30       82.84
          H |        113        1.13       83.97
          J |         71        0.71       84.68
          K |         77        0.77       85.45
          L |        209        2.09       87.54
          M |         69        0.69       88.23
          N |         51        0.51       88.74
          P |         89        0.89       89.63
          Q |         62        0.62       90.25
          R |        133        1.33       91.58
          S |        160        1.60       93.18
          T |         25        0.25       93.43
          U |         67        0.67       94.10
          V |         61        0.61       94.71
          W |         55        0.55       95.26
          X |         96        0.96       96.22
          Y |        108        1.08       97.30
          Z |        270        2.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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