Frequencies for first 10,000 rows of rail variable in accident dataset : Rail Grade | Xing ID | Freq. Percent Cum. ------------+----------------------------------- 0000000 | 9,903 99.03 99.03 0000009 | 4 0.04 99.07 025011J | 1 0.01 99.08 025394N | 1 0.01 99.09 026106V | 1 0.01 99.10 026175D | 1 0.01 99.11 026210P | 1 0.01 99.12 026642N | 1 0.01 99.13 026863R | 1 0.01 99.14 028445G | 1 0.01 99.15 028798U | 1 0.01 99.16 028855F | 1 0.01 99.17 028856M | 1 0.01 99.18 029301F | 1 0.01 99.19 057241Y | 1 0.01 99.20 057263Y | 1 0.01 99.21 062208E | 1 0.01 99.22 244953P | 1 0.01 99.23 253790G | 1 0.01 99.24 272101L | 1 0.01 99.25 2724659 | 1 0.01 99.26 272509J | 1 0.01 99.27 272549G | 1 0.01 99.28 352718N | 1 0.01 99.29 353047V | 1 0.01 99.30 387070T | 1 0.01 99.31 425200K | 1 0.01 99.32 425772L | 1 0.01 99.33 433825D | 1 0.01 99.34 434224X | 1 0.01 99.35 434240G | 1 0.01 99.36 434325J | 1 0.01 99.37 434331M | 1 0.01 99.38 437973L | 1 0.01 99.39 438163X | 1 0.01 99.40 439808H | 1 0.01 99.41 500819J | 1 0.01 99.42 540872E | 1 0.01 99.43 620974U | 1 0.01 99.44 6232259 | 1 0.01 99.45 624155S | 1 0.01 99.46 624337D | 1 0.01 99.47 624937F | 1 0.01 99.48 625523H | 1 0.01 99.49 672545J | 2 0.02 99.51 725376Y | 1 0.01 99.52 725388T | 1 0.01 99.53 725407V | 1 0.01 99.54 725409J | 1 0.01 99.55 726868H | 1 0.01 99.56 726946M | 1 0.01 99.57 727080G | 1 0.01 99.58 727081N | 1 0.01 99.59 727761J | 1 0.01 99.60 727839B | 1 0.01 99.61 727862V | 1 0.01 99.62 728180P | 1 0.01 99.63 728314L | 1 0.01 99.64 731779B | 1 0.01 99.65 731795K | 1 0.01 99.66 731894H | 1 0.01 99.67 741343C | 1 0.01 99.68 741357K | 1 0.01 99.69 741701J | 1 0.01 99.70 745974S | 1 0.01 99.71 745978U | 1 0.01 99.72 746046B | 1 0.01 99.73 749772H | 1 0.01 99.74 750478G | 1 0.01 99.75 750640U | 1 0.01 99.76 750738X | 1 0.01 99.77 752997R | 1 0.01 99.78 754921S | 1 0.01 99.79 756738T | 1 0.01 99.80 757266C | 1 0.01 99.81 760581W | 1 0.01 99.82 760730V | 1 0.01 99.83 760736L | 1 0.01 99.84 760751N | 1 0.01 99.85 766034L | 1 0.01 99.86 787374F | 1 0.01 99.87 787560G | 1 0.01 99.88 787595H | 1 0.01 99.89 790795V | 1 0.01 99.90 790802D | 1 0.01 99.91 804417U | 1 0.01 99.92 804487J | 1 0.01 99.93 833635E | 1 0.01 99.94 833920D | 1 0.01 99.95 868373Y | 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