Frequencies for first 10,000 rows of vin_7 variable in vehicle dataset :

      vin_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        134        1.34        1.34
          0 |        753        7.53        8.87
          1 |        871        8.71       17.58
          2 |        679        6.79       24.37
          3 |        540        5.40       29.77
          4 |        791        7.91       37.68
          5 |        610        6.10       43.78
          6 |        540        5.40       49.18
          7 |        617        6.17       55.35
          8 |        553        5.53       60.88
          9 |      1,220       12.20       73.08
          A |        198        1.98       75.06
          B |         94        0.94       76.00
          C |        152        1.52       77.52
          D |        120        1.20       78.72
          E |         80        0.80       79.52
          F |         76        0.76       80.28
          G |        148        1.48       81.76
          H |        133        1.33       83.09
          I |          3        0.03       83.12
          J |         69        0.69       83.81
          K |         73        0.73       84.54
          L |        256        2.56       87.10
          M |         63        0.63       87.73
          N |         76        0.76       88.49
          O |          1        0.01       88.50
          P |         98        0.98       89.48
          Q |         57        0.57       90.05
          R |        135        1.35       91.40
          S |        153        1.53       92.93
          T |         24        0.24       93.17
          U |         88        0.88       94.05
          V |         53        0.53       94.58
          W |         61        0.61       95.19
          X |         67        0.67       95.86
          Y |         93        0.93       96.79
          Z |        321        3.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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