Frequencies for vin_7 variable in vehicle dataset :

      vin_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         37        5.91        5.91
          1 |         96       15.34       21.25
          2 |        138       22.04       43.29
          3 |         45        7.19       50.48
          4 |         67       10.70       61.18
          5 |         44        7.03       68.21
          6 |         36        5.75       73.96
          7 |         17        2.72       76.68
          8 |         31        4.95       81.63
          9 |         87       13.90       95.53
          A |          3        0.48       96.01
          B |          9        1.44       97.44
          C |          1        0.16       97.60
          D |          3        0.48       98.08
          E |          3        0.48       98.56
          F |          1        0.16       98.72
          G |          2        0.32       99.04
          J |          1        0.16       99.20
          P |          1        0.16       99.36
          S |          1        0.16       99.52
          V |          1        0.16       99.68
          X |          2        0.32      100.00
------------+-----------------------------------
      Total |        626      100.00

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