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

       mcid |
    issuing |
  authority |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,216       92.16       92.16
          1 |          1        0.01       92.17
          6 |         95        0.95       93.12
         12 |         56        0.56       93.68
         13 |          3        0.03       93.71
         19 |          1        0.01       93.72
         24 |          2        0.02       93.74
         28 |          1        0.01       93.75
         31 |          1        0.01       93.76
         34 |          2        0.02       93.78
         36 |          1        0.01       93.79
         37 |          1        0.01       93.80
         39 |          1        0.01       93.81
         40 |          3        0.03       93.84
         42 |          2        0.02       93.86
         45 |          2        0.02       93.88
         46 |          1        0.01       93.89
         48 |          3        0.03       93.92
         56 |          2        0.02       93.94
         57 |        428        4.28       98.22
         58 |          1        0.01       98.23
         77 |         43        0.43       98.66
         88 |        103        1.03       99.69
         99 |         31        0.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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