Frequencies for first 10,000 rows of rail variable in accident dataset : rail grade | crossing | identifier | Freq. Percent Cum. ------------+----------------------------------- 0000000 | 9,962 99.62 99.62 025491X | 1 0.01 99.63 058708A | 1 0.01 99.64 058835B | 1 0.01 99.65 058862X | 1 0.01 99.66 063703R | 1 0.01 99.67 065630A | 1 0.01 99.68 245394V | 1 0.01 99.69 271962K | 1 0.01 99.70 272124T | 1 0.01 99.71 272475S | 1 0.01 99.72 272717K | 1 0.01 99.73 272742T | 1 0.01 99.74 279552N | 1 0.01 99.75 290498w | 1 0.01 99.76 352119T | 1 0.01 99.77 426237D | 1 0.01 99.78 438586X | 1 0.01 99.79 620854D | 1 0.01 99.80 628165L | 1 0.01 99.81 635114T | 1 0.01 99.82 637858G | 1 0.01 99.83 641227M | 1 0.01 99.84 717594K | 1 0.01 99.85 729311U | 1 0.01 99.86 741343C | 1 0.01 99.87 742369H | 1 0.01 99.88 752478N | 1 0.01 99.89 756877N | 1 0.01 99.90 787503N | 1 0.01 99.91 787816H | 1 0.01 99.92 804472U | 1 0.01 99.93 806091M | 1 0.01 99.94 848725X | 1 0.01 99.95 926249D | 1 0.01 99.96 9999999 | 3 0.03 99.99 999999u | 1 0.01 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016