Frequencies for first 10,000 rows of rail variable in accident dataset : Rail Grade | Xing ID | Freq. Percent Cum. ------------+----------------------------------- 0000000 | 9,897 98.97 98.97 0000009 | 6 0.06 99.03 002881P | 1 0.01 99.04 003229S | 1 0.01 99.05 026132K | 1 0.01 99.06 026189L | 1 0.01 99.07 026485X | 1 0.01 99.08 028585J | 1 0.01 99.09 028781R | 1 0.01 99.10 057259J | 1 0.01 99.11 1105280 | 1 0.01 99.12 244957S | 1 0.01 99.13 253038V | 1 0.01 99.14 271981K | 1 0.01 99.15 272090F | 1 0.01 99.16 272100F | 1 0.01 99.17 272387G | 1 0.01 99.18 272407D | 1 0.01 99.19 272495D | 1 0.01 99.20 272632L | 1 0.01 99.21 272975B | 1 0.01 99.22 351367N | 1 0.01 99.23 351459J | 1 0.01 99.24 352121U | 1 0.01 99.25 352198T | 1 0.01 99.26 352240D | 1 0.01 99.27 352345S | 1 0.01 99.28 421985H | 1 0.01 99.29 426236W | 1 0.01 99.30 426290P | 1 0.01 99.31 434232P | 1 0.01 99.32 434381R | 1 0.01 99.33 438204A | 1 0.01 99.34 500565W | 1 0.01 99.35 500578X | 1 0.01 99.36 540857C | 1 0.01 99.37 600699W | 1 0.01 99.38 620745B | 1 0.01 99.39 621239D | 1 0.01 99.40 621446W | 1 0.01 99.41 624308T | 1 0.01 99.42 624316K | 1 0.01 99.43 624332F | 1 0.01 99.44 624367L | 1 0.01 99.45 624438A | 1 0.01 99.46 624543D | 1 0.01 99.47 624688C | 1 0.01 99.48 626766C | 1 0.01 99.49 627220R | 1 0.01 99.50 628095Y | 1 0.01 99.51 628347J | 1 0.01 99.52 661952G | 1 0.01 99.53 662039F | 1 0.01 99.54 687595G | 1 0.01 99.55 719027A | 1 0.01 99.56 723133A | 1 0.01 99.57 725392H | 1 0.01 99.58 725422X | 1 0.01 99.59 726016E | 1 0.01 99.60 726060S | 1 0.01 99.61 726378R | 1 0.01 99.62 726748S | 1 0.01 99.63 726756J | 1 0.01 99.64 727133D | 1 0.01 99.65 731815U | 1 0.01 99.66 731908N | 1 0.01 99.67 731956D | 1 0.01 99.68 741659M | 1 0.01 99.69 741681A | 1 0.01 99.70 742030R | 1 0.01 99.71 745890W | 1 0.01 99.72 745922A | 1 0.01 99.73 746930V | 1 0.01 99.74 746934X | 1 0.01 99.75 747282J | 1 0.01 99.76 747835D | 1 0.01 99.77 747857D | 1 0.01 99.78 748725W | 2 0.02 99.80 750501Y | 1 0.01 99.81 750602K | 1 0.01 99.82 754870J | 1 0.01 99.83 757261T | 1 0.01 99.84 760581W | 2 0.02 99.86 760690A | 1 0.01 99.87 760723K | 1 0.01 99.88 787696U | 1 0.01 99.89 787794K | 1 0.01 99.90 789012B | 1 0.01 99.91 789150P | 1 0.01 99.92 804476W | 1 0.01 99.93 804480L | 1 0.01 99.94 810997B | 1 0.01 99.95 833693A | 1 0.01 99.96 834005N | 1 0.01 99.97 856719P | 1 0.01 99.98 9999999 | 2 0.02 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016