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

        vin |
character(4 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.03        0.03
          0 |         59        0.59        0.62
          1 |        357        3.57        4.19
          2 |         28        0.28        4.47
          3 |         45        0.45        4.92
          4 |         45        0.45        5.37
          5 |         55        0.55        5.92
          6 |         36        0.36        6.28
          7 |         18        0.18        6.46
          8 |         26        0.26        6.72
          9 |        488        4.88       11.60
          A |        600        6.00       17.60
          B |        799        7.99       25.59
          C |        801        8.01       33.60
          D |        613        6.13       39.73
          E |        859        8.59       48.32
          F |        630        6.30       54.62
          G |        554        5.54       60.16
          H |        603        6.03       66.19
          I |          1        0.01       66.20
          J |        337        3.37       69.57
          K |        288        2.88       72.45
          L |        125        1.25       73.70
          M |        113        1.13       74.83
          N |        263        2.63       77.46
          P |        212        2.12       79.58
          Q |          1        0.01       79.59
          R |        546        5.46       85.05
          S |        301        3.01       88.06
          T |         97        0.97       89.03
          U |         94        0.94       89.97
          V |        161        1.61       91.58
          W |        234        2.34       93.92
          X |         38        0.38       94.30
          Y |        189        1.89       96.19
          Z |        381        3.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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