Frequencies for first 10,000 rows of vin_2 variable in vehicle dataset :

        vin |
character(2 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         28        0.28        0.28
          1 |         10        0.10        0.38
          2 |         12        0.12        0.50
          3 |          4        0.04        0.54
          4 |          6        0.06        0.60
          5 |         13        0.13        0.73
          6 |          2        0.02        0.75
          7 |          5        0.05        0.80
          8 |         11        0.11        0.91
          9 |        392        3.92        4.83
          A |        195        1.95        6.78
          B |        431        4.31       11.09
          C |        210        2.10       13.19
          D |        289        2.89       16.08
          E |         11        0.11       16.19
          F |      1,586       15.86       32.05
          G |      1,828       18.28       50.33
          H |      1,304       13.04       63.37
          J |        210        2.10       65.47
          K |        143        1.43       66.90
          L |         92        0.92       67.82
          M |        364        3.64       71.46
          N |        845        8.45       79.91
          P |         43        0.43       80.34
          R |          4        0.04       80.38
          S |        231        2.31       82.69
          T |      1,017       10.17       92.86
          U |         25        0.25       93.11
          V |        213        2.13       95.24
          W |         12        0.12       95.36
          X |        172        1.72       97.08
          Y |        243        2.43       99.51
          Z |         49        0.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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