Frequencies for first 10,000 rows of vin_6 variable in vehicle dataset :

      vin_6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         63        0.63        0.63
           |          1        0.01        0.64
          0 |        955        9.55       10.19
          1 |      1,324       13.24       23.43
          2 |        846        8.46       31.89
          3 |        653        6.53       38.42
          4 |        592        5.92       44.34
          5 |        635        6.35       50.69
          6 |        643        6.43       57.12
          7 |        660        6.60       63.72
          8 |        648        6.48       70.20
          9 |      1,282       12.82       83.02
          A |        346        3.46       86.48
          B |        102        1.02       87.50
          C |         86        0.86       88.36
          D |         91        0.91       89.27
          E |        104        1.04       90.31
          F |         84        0.84       91.15
          G |         73        0.73       91.88
          H |        158        1.58       93.46
          I |          1        0.01       93.47
          J |         57        0.57       94.04
          K |         62        0.62       94.66
          L |         64        0.64       95.30
          M |         31        0.31       95.61
          N |         33        0.33       95.94
          O |          1        0.01       95.95
          P |         62        0.62       96.57
          Q |          7        0.07       96.64
          R |         37        0.37       97.01
          S |         55        0.55       97.56
          T |         60        0.60       98.16
          U |         24        0.24       98.40
          V |         18        0.18       98.58
          W |         10        0.10       98.68
          X |         23        0.23       98.91
          Y |         23        0.23       99.14
          Z |         86        0.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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