Frequencies for first 10,000 rows of rail variable in accident dataset : RAIL XING | ID | Freq. Percent Cum. ------------+----------------------------------- 0000000 | 9,959 99.59 99.59 000900L | 1 0.01 99.60 025215V | 1 0.01 99.61 028446N | 1 0.01 99.62 079613A | 1 0.01 99.63 272517B | 1 0.01 99.64 294456Y | 1 0.01 99.65 330570X | 1 0.01 99.66 330578C | 2 0.02 99.68 434305X | 1 0.01 99.69 434355B | 1 0.01 99.70 479891V | 1 0.01 99.71 504403H | 1 0.01 99.72 543156Y | 1 0.01 99.73 622312B | 1 0.01 99.74 622857f | 1 0.01 99.75 627561Y | 1 0.01 99.76 628186E | 1 0.01 99.77 631121p | 1 0.01 99.78 637404H | 1 0.01 99.79 637584H | 1 0.01 99.80 638571k | 1 0.01 99.81 726135N | 1 0.01 99.82 726692A | 1 0.01 99.83 731-993 | 1 0.01 99.84 746053L | 1 0.01 99.85 748156T | 1 0.01 99.86 749707c | 1 0.01 99.87 750643p | 1 0.01 99.88 751691h | 1 0.01 99.89 752779j | 1 0.01 99.90 753408c | 1 0.01 99.91 754935A | 1 0.01 99.92 755097k | 1 0.01 99.93 757414u | 1 0.01 99.94 804393H | 1 0.01 99.95 868331M | 1 0.01 99.96 874931D | 1 0.01 99.97 9999999 | 3 0.03 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016