Frequencies for vin_4 variable in vehicle dataset :

      vin_4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         21        3.35        3.35
          1 |          8        1.28        4.63
          2 |          4        0.64        5.27
          3 |          4        0.64        5.91
          4 |          1        0.16        6.07
          5 |          1        0.16        6.23
          7 |          1        0.16        6.39
          8 |          1        0.16        6.55
          9 |         69       11.02       17.57
          A |         81       12.94       30.51
          B |         55        8.79       39.30
          C |         34        5.43       44.73
          D |         24        3.83       48.56
          E |         49        7.83       56.39
          F |         25        3.99       60.38
          G |         37        5.91       66.29
          H |         13        2.08       68.37
          J |         17        2.72       71.09
          K |          5        0.80       71.88
          L |         11        1.76       73.64
          M |         11        1.76       75.40
          N |          9        1.44       76.84
          P |         21        3.35       80.19
          R |         19        3.04       83.23
          S |         21        3.35       86.58
          T |         15        2.40       88.98
          U |         13        2.08       91.05
          V |         15        2.40       93.45
          W |         12        1.92       95.37
          X |          1        0.16       95.53
          Y |          9        1.44       96.96
          Z |         19        3.04      100.00
------------+-----------------------------------
      Total |        626      100.00

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