Frequencies for first 10,000 rows of mcarr_i1 variable in vehicle dataset :

       mcid |
    issuing |
  authority |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,198       91.98       91.98
          1 |          2        0.02       92.00
          5 |          1        0.01       92.01
          6 |        126        1.26       93.27
          8 |          3        0.03       93.30
         10 |          4        0.04       93.34
         12 |         51        0.51       93.85
         13 |          2        0.02       93.87
         18 |          3        0.03       93.90
         19 |          2        0.02       93.92
         37 |          2        0.02       93.94
         39 |          1        0.01       93.95
         40 |          1        0.01       93.96
         42 |          1        0.01       93.97
         45 |          2        0.02       93.99
         47 |          1        0.01       94.00
         51 |          3        0.03       94.03
         55 |          1        0.01       94.04
         56 |          1        0.01       94.05
         57 |        454        4.54       98.59
         58 |          1        0.01       98.60
         77 |         44        0.44       99.04
         88 |         61        0.61       99.65
         99 |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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