Frequencies for first 10,000 rows of rail variable in accident dataset : Rail Grade | Xing ID | Freq. Percent Cum. ------------+----------------------------------- 0000000 | 9,901 99.01 99.01 0000009 | 1 0.01 99.02 003470T | 1 0.01 99.03 025241K | 1 0.01 99.04 026475S | 1 0.01 99.05 026763L | 1 0.01 99.06 027643Y | 1 0.01 99.07 028207N | 1 0.01 99.08 028384T | 1 0.01 99.09 028601R | 1 0.01 99.10 028637Y | 1 0.01 99.11 029290V | 1 0.01 99.12 029357A | 1 0.01 99.13 029570X | 2 0.02 99.15 057187H | 1 0.01 99.16 272165X | 1 0.01 99.17 272196W | 1 0.01 99.18 272708L | 1 0.01 99.19 272722G | 1 0.01 99.20 278111K | 1 0.01 99.21 349964V | 1 0.01 99.22 352058E | 1 0.01 99.23 426118U | 1 0.01 99.24 433914V | 1 0.01 99.25 434224X | 1 0.01 99.26 434362L | 1 0.01 99.27 434377B | 1 0.01 99.28 434382X | 1 0.01 99.29 434423A | 1 0.01 99.30 437622M | 1 0.01 99.31 437660X | 1 0.01 99.32 437745Y | 1 0.01 99.33 500643B | 1 0.01 99.34 516197F | 1 0.01 99.35 600634D | 1 0.01 99.36 600669E | 1 0.01 99.37 620831W | 1 0.01 99.38 621747S | 1 0.01 99.39 622080N | 1 0.01 99.40 624533K | 1 0.01 99.41 625043W | 1 0.01 99.42 625706B | 1 0.01 99.43 626677W | 1 0.01 99.44 628095Y | 1 0.01 99.45 661952G | 1 0.01 99.46 664036S | 1 0.01 99.47 664076P | 1 0.01 99.48 667516W | 1 0.01 99.49 667981M | 1 0.01 99.50 668051H | 1 0.01 99.51 668077K | 1 0.01 99.52 725401E | 1 0.01 99.53 725420J | 1 0.01 99.54 725832W | 1 0.01 99.55 726849D | 1 0.01 99.56 727085R | 1 0.01 99.57 727450H | 1 0.01 99.58 727635P | 1 0.01 99.59 728167B | 1 0.01 99.60 728288Y | 1 0.01 99.61 731680R | 1 0.01 99.62 731702N | 1 0.01 99.63 731790B | 1 0.01 99.64 731858M | 1 0.01 99.65 741100A | 1 0.01 99.66 741297D | 1 0.01 99.67 746932J | 1 0.01 99.68 746934X | 1 0.01 99.69 746936L | 2 0.02 99.71 747685X | 1 0.01 99.72 747859S | 2 0.02 99.74 750121S | 1 0.01 99.75 751831H | 1 0.01 99.76 753036M | 1 0.01 99.77 754830L | 1 0.01 99.78 755037B | 1 0.01 99.79 756969B | 1 0.01 99.80 757129V | 1 0.01 99.81 757169T | 1 0.01 99.82 760717G | 1 0.01 99.83 787554D | 1 0.01 99.84 787560G | 1 0.01 99.85 787595H | 1 0.01 99.86 787656W | 1 0.01 99.87 787680X | 1 0.01 99.88 787835M | 1 0.01 99.89 787842X | 1 0.01 99.90 788992J | 1 0.01 99.91 788993R | 1 0.01 99.92 810883N | 1 0.01 99.93 811057R | 1 0.01 99.94 856721R | 1 0.01 99.95 868034U | 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