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

      vin_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         20        0.20        0.20
          0 |        451        4.51        4.71
          1 |      1,301       13.01       17.72
          2 |      1,261       12.61       30.33
          3 |        745        7.45       37.78
          4 |      1,509       15.09       52.87
          5 |        834        8.34       61.21
          6 |        881        8.81       70.02
          7 |        422        4.22       74.24
          8 |        517        5.17       79.41
          9 |      1,038       10.38       89.79
          A |         73        0.73       90.52
          B |         32        0.32       90.84
          C |         67        0.67       91.51
          D |         50        0.50       92.01
          E |         68        0.68       92.69
          F |         34        0.34       93.03
          G |         36        0.36       93.39
          H |         31        0.31       93.70
          J |         31        0.31       94.01
          K |         22        0.22       94.23
          L |        103        1.03       95.26
          M |         34        0.34       95.60
          N |         12        0.12       95.72
          P |         38        0.38       96.10
          Q |          8        0.08       96.18
          R |         46        0.46       96.64
          S |         45        0.45       97.09
          T |         17        0.17       97.26
          U |         19        0.19       97.45
          V |         24        0.24       97.69
          W |         17        0.17       97.86
          X |         31        0.31       98.17
          Y |        115        1.15       99.32
          Z |         68        0.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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