Frequencies for first 10,000 rows of vin_4 variable in vehicle dataset :

      vin_4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         24        0.24        0.24
          0 |        846        8.46        8.70
          1 |      1,145       11.45       20.15
          2 |        997        9.97       30.12
          3 |      1,122       11.22       41.34
          4 |        563        5.63       46.97
          5 |        646        6.46       53.43
          6 |        551        5.51       58.94
          7 |        839        8.39       67.33
          8 |        376        3.76       71.09
          9 |      1,829       18.29       89.38
          A |        180        1.80       91.18
          B |         85        0.85       92.03
          C |        110        1.10       93.13
          D |         37        0.37       93.50
          E |         17        0.17       93.67
          F |         30        0.30       93.97
          G |         85        0.85       94.82
          H |         52        0.52       95.34
          J |         38        0.38       95.72
          K |         17        0.17       95.89
          L |         66        0.66       96.55
          M |         14        0.14       96.69
          N |          1        0.01       96.70
          O |          4        0.04       96.74
          P |         12        0.12       96.86
          Q |          1        0.01       96.87
          R |         17        0.17       97.04
          S |         42        0.42       97.46
          T |         20        0.20       97.66
          U |          5        0.05       97.71
          V |         13        0.13       97.84
          W |          8        0.08       97.92
          X |          2        0.02       97.94
          Y |        205        2.05       99.99
          Z |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016