Frequencies for first 10,000 rows of vin_10 variable in vehicle dataset :

     vin_10 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        148        1.48        1.48
          0 |        141        1.41        2.89
          1 |        112        1.12        4.01
          2 |        126        1.26        5.27
          3 |        106        1.06        6.33
          4 |        120        1.20        7.53
          5 |        139        1.39        8.92
          6 |        117        1.17       10.09
          7 |        125        1.25       11.34
          8 |        119        1.19       12.53
          9 |        512        5.12       17.65
          B |        217        2.17       19.82
          C |        221        2.21       22.03
          D |        265        2.65       24.68
          E |        415        4.15       28.83
          F |        464        4.64       33.47
          G |        565        5.65       39.12
          H |        514        5.14       44.26
          J |        635        6.35       50.61
          K |        626        6.26       56.87
          L |        569        5.69       62.56
          M |        596        5.96       68.52
          N |        506        5.06       73.58
          P |        654        6.54       80.12
          R |        668        6.68       86.80
          S |        749        7.49       94.29
          T |        516        5.16       99.45
          V |         54        0.54       99.99
          X |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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