Frequencies for first 10,000 rows of rail variable in accident dataset : Rail Grade | Xing ID | Freq. Percent Cum. ------------+----------------------------------- 0000000 | 9,869 98.69 98.69 003634G | 1 0.01 98.70 025004Y | 1 0.01 98.71 026106V | 1 0.01 98.72 026480N | 1 0.01 98.73 026514F | 1 0.01 98.74 026572B | 1 0.01 98.75 026838H | 1 0.01 98.76 026852D | 1 0.01 98.77 027215C | 1 0.01 98.78 028845A | 1 0.01 98.79 029016G | 1 0.01 98.80 029473N | 1 0.01 98.81 029651X | 1 0.01 98.82 128188T | 1 0.01 98.83 253113E | 1 0.01 98.84 253131C | 1 0.01 98.85 253244H | 1 0.01 98.86 253295T | 1 0.01 98.87 272467A | 1 0.01 98.88 272516U | 1 0.01 98.89 351463R | 1 0.01 98.90 352099J | 1 0.01 98.91 352112U | 1 0.01 98.92 425313R | 1 0.01 98.93 425775G | 1 0.01 98.94 425812G | 1 0.01 98.95 426099S | 1 0.01 98.96 426237D | 1 0.01 98.97 426402L | 1 0.01 98.98 426407V | 1 0.01 98.99 433821B | 1 0.01 99.00 434238F | 1 0.01 99.01 434243C | 1 0.01 99.02 434309A | 1 0.01 99.03 434477F | 1 0.01 99.04 437821P | 1 0.01 99.05 437987U | 1 0.01 99.06 439820P | 1 0.01 99.07 498993P | 1 0.01 99.08 500538A | 1 0.01 99.09 516286Y | 1 0.01 99.10 597510D | 1 0.01 99.11 600703J | 1 0.01 99.12 620642A | 1 0.01 99.13 621821U | 1 0.01 99.14 622058B | 1 0.01 99.15 622167E | 1 0.01 99.16 622988J | 1 0.01 99.17 623082F | 1 0.01 99.18 623161S | 1 0.01 99.19 623234A | 1 0.01 99.20 624131D | 1 0.01 99.21 624768V | 1 0.01 99.22 624835M | 1 0.01 99.23 624879M | 1 0.01 99.24 625374J | 1 0.01 99.25 625569W | 1 0.01 99.26 626276W | 1 0.01 99.27 627561Y | 1 0.01 99.28 636655Y | 1 0.01 99.29 637871V | 1 0.01 99.30 637909P | 1 0.01 99.31 637912X | 1 0.01 99.32 664089R | 1 0.01 99.33 668056S | 1 0.01 99.34 673067P | 1 0.01 99.35 686251D | 1 0.01 99.36 725007L | 1 0.01 99.37 725283E | 1 0.01 99.38 727130H | 2 0.02 99.40 728031N | 1 0.01 99.41 742367U | 1 0.01 99.42 745446R | 1 0.01 99.43 745990B | 1 0.01 99.44 746916A | 1 0.01 99.45 746964P | 1 0.01 99.46 747663X | 1 0.01 99.47 748010A | 1 0.01 99.48 749412K | 1 0.01 99.49 749961E | 1 0.01 99.50 750493J | 1 0.01 99.51 750511E | 1 0.01 99.52 751059M | 1 0.01 99.53 751300L | 1 0.01 99.54 752693A | 1 0.01 99.55 752753G | 1 0.01 99.56 752843F | 1 0.01 99.57 752917V | 2 0.02 99.59 754625F | 1 0.01 99.60 756796N | 1 0.01 99.61 756969B | 1 0.01 99.62 757090U | 1 0.01 99.63 757194B | 1 0.01 99.64 757241G | 1 0.01 99.65 760723K | 1 0.01 99.66 761604E | 1 0.01 99.67 787554D | 1 0.01 99.68 787822L | 1 0.01 99.69 788996L | 1 0.01 99.70 804360V | 1 0.01 99.71 804596M | 1 0.01 99.72 805143Y | 1 0.01 99.73 810997B | 1 0.01 99.74 811096G | 1 0.01 99.75 831199L | 1 0.01 99.76 833859C | 1 0.01 99.77 834047A | 1 0.01 99.78 834942G | 1 0.01 99.79 853775L | 1 0.01 99.80 860863N | 1 0.01 99.81 9999999 | 19 0.19 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Apr 2016