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

      vin_4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         51        0.51        0.51
          0 |        728        7.28        7.79
          1 |      1,223       12.23       20.02
          2 |      1,037       10.37       30.39
          3 |      1,056       10.56       40.95
          4 |        535        5.35       46.30
          5 |        660        6.60       52.90
          6 |        472        4.72       57.62
          7 |        855        8.55       66.17
          8 |        331        3.31       69.48
          9 |      1,916       19.16       88.64
          A |        174        1.74       90.38
          B |        113        1.13       91.51
          C |        109        1.09       92.60
          D |         33        0.33       92.93
          E |         19        0.19       93.12
          F |         28        0.28       93.40
          G |         93        0.93       94.33
          H |         73        0.73       95.06
          I |          1        0.01       95.07
          J |         57        0.57       95.64
          K |         10        0.10       95.74
          L |         68        0.68       96.42
          M |         30        0.30       96.72
          N |          3        0.03       96.75
          O |          3        0.03       96.78
          P |          4        0.04       96.82
          Q |          1        0.01       96.83
          R |         11        0.11       96.94
          S |         44        0.44       97.38
          T |         24        0.24       97.62
          U |          4        0.04       97.66
          V |          9        0.09       97.75
          W |          1        0.01       97.76
          X |          3        0.03       97.79
          Y |        218        2.18       99.97
          Z |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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