Frequencies for vin_1 variable in vehicle dataset :

      vin_1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         12        1.57        1.57
          1 |        171       22.38       23.95
          2 |         48        6.28       30.24
          3 |         12        1.57       31.81
          4 |         17        2.23       34.03
          6 |          5        0.65       34.69
          7 |          3        0.39       35.08
          8 |          4        0.52       35.60
          9 |         88       11.52       47.12
          A |          6        0.79       47.91
          B |          1        0.13       48.04
          C |          5        0.65       48.69
          E |          5        0.65       49.35
          F |          6        0.79       50.13
          G |          1        0.13       50.26
          H |          4        0.52       50.79
          J |        310       40.58       91.36
          K |         31        4.06       95.42
          L |          1        0.13       95.55
          M |          1        0.13       95.68
          N |          3        0.39       96.07
          P |          1        0.13       96.20
          R |          4        0.52       96.73
          S |          2        0.26       96.99
          T |          9        1.18       98.17
          U |          3        0.39       98.56
          V |          1        0.13       98.69
          W |          5        0.65       99.35
          X |          2        0.26       99.61
          Y |          3        0.39      100.00
------------+-----------------------------------
      Total |        764      100.00

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