Frequencies for first 10,000 rows of vin_4 variable in vehicle dataset :

      vin_4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         44        0.44        0.44
          1 |        338        3.38        3.82
          2 |         10        0.10        3.92
          3 |         31        0.31        4.23
          4 |         32        0.32        4.55
          5 |         83        0.83        5.38
          6 |         14        0.14        5.52
          7 |         25        0.25        5.77
          8 |         10        0.10        5.87
          9 |        320        3.20        9.07
          A |        593        5.93       15.00
          B |        616        6.16       21.16
          C |        797        7.97       29.13
          D |        689        6.89       36.02
          E |      1,052       10.52       46.54
          F |        674        6.74       53.28
          G |        639        6.39       59.67
          H |        607        6.07       65.74
          J |        322        3.22       68.96
          K |        199        1.99       70.95
          L |        188        1.88       72.83
          M |        117        1.17       74.00
          N |        261        2.61       76.61
          P |        216        2.16       78.77
          R |        443        4.43       83.20
          S |        371        3.71       86.91
          T |         84        0.84       87.75
          U |         66        0.66       88.41
          V |        184        1.84       90.25
          W |        318        3.18       93.43
          X |         40        0.40       93.83
          Y |        233        2.33       96.16
          Z |        384        3.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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