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

        vin |
character(2 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         26        0.26        0.26
          1 |         17        0.17        0.43
          2 |          2        0.02        0.45
          3 |          8        0.08        0.53
          4 |          2        0.02        0.55
          5 |         12        0.12        0.67
          6 |          4        0.04        0.71
          7 |          5        0.05        0.76
          8 |          4        0.04        0.80
          9 |        367        3.67        4.47
          A |        212        2.12        6.59
          B |        400        4.00       10.59
          C |        190        1.90       12.49
          D |        306        3.06       15.55
          E |         11        0.11       15.66
          F |      1,560       15.60       31.26
          G |      1,906       19.06       50.32
          H |      1,335       13.35       63.67
          I |          1        0.01       63.68
          J |        263        2.63       66.31
          K |        114        1.14       67.45
          L |         99        0.99       68.44
          M |        354        3.54       71.98
          N |        800        8.00       79.98
          O |          1        0.01       79.99
          P |         44        0.44       80.43
          Q |          1        0.01       80.44
          R |          6        0.06       80.50
          S |        296        2.96       83.46
          T |        979        9.79       93.25
          U |         10        0.10       93.35
          V |        212        2.12       95.47
          W |         12        0.12       95.59
          X |        162        1.62       97.21
          Y |        239        2.39       99.60
          Z |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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