Frequencies for first 10,000 rows of rail variable in accident dataset : Rail Grade | Xing ID | Freq. Percent Cum. ------------+----------------------------------- 0000000 | 9,907 99.07 99.07 0000040 | 1 0.01 99.08 0000900 | 1 0.01 99.09 002858B | 1 0.01 99.10 003228K | 1 0.01 99.11 026095K | 1 0.01 99.12 026490U | 1 0.01 99.13 027254T | 1 0.01 99.14 027304U | 1 0.01 99.15 028317Y | 1 0.01 99.16 028707L | 1 0.01 99.17 028773Y | 1 0.01 99.18 028781R | 1 0.01 99.19 028851D | 1 0.01 99.20 029557J | 1 0.01 99.21 140733E | 1 0.01 99.22 253033L | 1 0.01 99.23 272538U | 1 0.01 99.24 272567E | 1 0.01 99.25 330503D | 1 0.01 99.26 351314P | 1 0.01 99.27 352969H | 1 0.01 99.28 424929N | 1 0.01 99.29 425778C | 1 0.01 99.30 425781K | 1 0.01 99.31 434231H | 1 0.01 99.32 437817A | 1 0.01 99.33 437828M | 1 0.01 99.34 438027X | 1 0.01 99.35 500853R | 1 0.01 99.36 531635U | 1 0.01 99.37 532201K | 1 0.01 99.38 532214L | 1 0.01 99.39 600731M | 1 0.01 99.40 621274R | 1 0.01 99.41 624577K | 1 0.01 99.42 624748J | 1 0.01 99.43 625251X | 1 0.01 99.44 628322C | 1 0.01 99.45 636716M | 1 0.01 99.46 639722B | 1 0.01 99.47 664060T | 1 0.01 99.48 664072M | 1 0.01 99.49 665982M | 1 0.01 99.50 672523J | 1 0.01 99.51 727098S | 1 0.01 99.52 727438B | 1 0.01 99.53 727782C | 1 0.01 99.54 728224M | 1 0.01 99.55 7414558 | 1 0.01 99.56 745722R | 1 0.01 99.57 746810E | 1 0.01 99.58 747861T | 1 0.01 99.59 747871Y | 1 0.01 99.60 747942T | 1 0.01 99.61 750489U | 1 0.01 99.62 750498T | 1 0.01 99.63 752750L | 1 0.01 99.64 752914A | 1 0.01 99.65 752922S | 1 0.01 99.66 753048G | 1 0.01 99.67 753407V | 1 0.01 99.68 756867H | 1 0.01 99.69 757155K | 1 0.01 99.70 757194B | 1 0.01 99.71 757414U | 1 0.01 99.72 789041L | 1 0.01 99.73 804352D | 1 0.01 99.74 804487J | 1 0.01 99.75 804595F | 1 0.01 99.76 804596M | 1 0.01 99.77 805327Y | 1 0.01 99.78 805403P | 1 0.01 99.79 810833N | 1 0.01 99.80 810951M | 1 0.01 99.81 834057F | 1 0.01 99.82 834059U | 1 0.01 99.83 834186V | 1 0.01 99.84 852102V | 1 0.01 99.85 860193Y | 1 0.01 99.86 868259Y | 1 0.01 99.87 868528N | 1 0.01 99.88 872131K | 1 0.01 99.89 9999999 | 11 0.11 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Apr 2016