Frequencies for mcarr_id variable in vehicle dataset :

      MOTOR |
 CARRIER ID |      Freq.     Percent        Cum.
------------+-----------------------------------
00000000000 |        646       89.10       89.10
99999999999 |         79       10.90      100.00
------------+-----------------------------------
      Total |        725      100.00

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