Frequencies for first 10,000 rows of vin_2 variable in vehicle dataset :

      vin_2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         31        0.31        0.31
          1 |        126        1.26        1.57
          2 |         67        0.67        2.24
          3 |         45        0.45        2.69
          4 |         20        0.20        2.89
          5 |         12        0.12        3.01
          6 |         20        0.20        3.21
          7 |         14        0.14        3.35
          8 |         35        0.35        3.70
          9 |        363        3.63        7.33
          A |        199        1.99        9.32
          B |        544        5.44       14.76
          C |        246        2.46       17.22
          D |         71        0.71       17.93
          E |         48        0.48       18.41
          F |      1,839       18.39       36.80
          G |      2,331       23.31       60.11
          H |        917        9.17       69.28
          J |        175        1.75       71.03
          K |         99        0.99       72.02
          L |        116        1.16       73.18
          M |        454        4.54       77.72
          N |        626        6.26       83.98
          P |        169        1.69       85.67
          Q |          5        0.05       85.72
          R |         14        0.14       85.86
          S |        177        1.77       87.63
          T |        715        7.15       94.78
          U |          6        0.06       94.84
          V |        161        1.61       96.45
          W |         29        0.29       96.74
          X |        171        1.71       98.45
          Y |        108        1.08       99.53
          Z |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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