Frequencies for mcarr_i1 variable in vehicle dataset :

       MCID |
    ISSUING |
  AUTHORITY |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        490       90.07       90.07
         99 |         54        9.93      100.00
------------+-----------------------------------
      Total |        544      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016