Frequencies for first 10,000 rows of vin_9 variable in vehicle dataset :

      vin_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,052       10.52       10.52
          / |          1        0.01       10.53
          0 |      3,686       36.86       47.39
          1 |        728        7.28       54.67
          2 |        591        5.91       60.58
          3 |        484        4.84       65.42
          4 |        429        4.29       69.71
          5 |        405        4.05       73.76
          6 |        370        3.70       77.46
          7 |        347        3.47       80.93
          8 |        355        3.55       84.48
          9 |      1,498       14.98       99.46
          A |          4        0.04       99.50
          B |          1        0.01       99.51
          C |          4        0.04       99.55
          D |          2        0.02       99.57
          G |          2        0.02       99.59
          L |          1        0.01       99.60
          O |         30        0.30       99.90
          P |          1        0.01       99.91
          Q |          1        0.01       99.92
          R |          2        0.02       99.94
          S |          2        0.02       99.96
          T |          1        0.01       99.97
          U |          1        0.01       99.98
          V |          1        0.01       99.99
          Y |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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