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

 Rail Grade |
    Xing ID |      Freq.     Percent        Cum.
------------+-----------------------------------
    ******* |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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