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

      vin_2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          5        0.05        0.05
          + |          1        0.01        0.06
          0 |        319        3.19        3.25
          1 |      1,143       11.43       14.68
          2 |        544        5.44       20.12
          3 |        662        6.62       26.74
          4 |        301        3.01       29.75
          5 |        368        3.68       33.43
          6 |        529        5.29       38.72
          7 |        173        1.73       40.45
          8 |        158        1.58       42.03
          9 |      1,367       13.67       55.70
          A |        312        3.12       58.82
          B |        292        2.92       61.74
          C |        328        3.28       65.02
          D |        137        1.37       66.39
          E |        239        2.39       68.78
          F |        153        1.53       70.31
          G |        114        1.14       71.45
          H |        385        3.85       75.30
          I |          6        0.06       75.36
          J |        262        2.62       77.98
          K |        291        2.91       80.89
          L |        463        4.63       85.52
          M |        163        1.63       87.15
          N |        114        1.14       88.29
          O |          9        0.09       88.38
          P |        146        1.46       89.84
          Q |         17        0.17       90.01
          R |        292        2.92       92.93
          S |        115        1.15       94.08
          T |        148        1.48       95.56
          U |         55        0.55       96.11
          V |         89        0.89       97.00
          W |         38        0.38       97.38
          X |         79        0.79       98.17
          Y |        113        1.13       99.30
          Z |         70        0.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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