Frequencies for first 10,000 rows of rail variable in accident dataset : RAIL XING | ID | Freq. Percent Cum. ------------+----------------------------------- 0000000 | 9,961 99.61 99.61 026517B | 1 0.01 99.62 028397U | 1 0.01 99.63 028429L | 1 0.01 99.64 028582N | 1 0.01 99.65 038403U | 1 0.01 99.66 272380J | 1 0.01 99.67 272465L | 1 0.01 99.68 330455R | 1 0.01 99.69 352066W | 1 0.01 99.70 43592 | 1 0.01 99.71 437912V | 1 0.01 99.72 504428D | 1 0.01 99.73 621282H | 1 0.01 99.74 622318S | 1 0.01 99.75 622599D | 1 0.01 99.76 624381R | 1 0.01 99.77 624383E | 1 0.01 99.78 628170H | 1 0.01 99.79 628191B | 1 0.01 99.80 639242P | 1 0.01 99.81 665265P | 1 0.01 99.82 725212H | 1 0.01 99.83 725837F | 1 0.01 99.84 728154A | 1 0.01 99.85 751289N | 1 0.01 99.86 752478N | 1 0.01 99.87 752772L | 1 0.01 99.88 760732J | 1 0.01 99.89 762301Y | 1 0.01 99.90 787543R | 1 0.01 99.91 787736P | 1 0.01 99.92 790827Y | 1 0.01 99.93 831196R | 1 0.01 99.94 833642P | 1 0.01 99.95 838257D | 1 0.01 99.96 9999999 | 4 0.04 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016