Frequencies for first 10,000 rows of sch_bus variable in accident dataset :

 School Bus |
    Related |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,968       99.68       99.68
          1 |         32        0.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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