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

       mcid |
    issuing |
  authority |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,200       92.00       92.00
          1 |          3        0.03       92.03
          5 |          1        0.01       92.04
          6 |         78        0.78       92.82
          8 |          1        0.01       92.83
         10 |          2        0.02       92.85
         12 |         25        0.25       93.10
         13 |          3        0.03       93.13
         17 |          1        0.01       93.14
         18 |          2        0.02       93.16
         21 |          1        0.01       93.17
         24 |          2        0.02       93.19
         26 |          1        0.01       93.20
         34 |          2        0.02       93.22
         40 |          1        0.01       93.23
         42 |          3        0.03       93.26
         47 |          3        0.03       93.29
         48 |          1        0.01       93.30
         51 |          1        0.01       93.31
         54 |          1        0.01       93.32
         57 |        520        5.20       98.52
         58 |          1        0.01       98.53
         77 |         39        0.39       98.92
         88 |         61        0.61       99.53
         99 |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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