Frequencies for first 10,000 rows of rail variable in accident dataset : Rail Grade | Xing ID | Freq. Percent Cum. ------------+----------------------------------- 0000000 | 9,933 99.33 99.33 0000009 | 1 0.01 99.34 003528Y | 1 0.01 99.35 003639R | 1 0.01 99.36 025425K | 1 0.01 99.37 025887B | 1 0.01 99.38 026470H | 1 0.01 99.39 026560G | 1 0.01 99.40 026822L | 1 0.01 99.41 027050G | 1 0.01 99.42 028647E | 1 0.01 99.43 028726R | 1 0.01 99.44 028931W | 1 0.01 99.45 272095K | 1 0.01 99.46 272549G | 1 0.01 99.47 330445K | 1 0.01 99.48 339785C | 1 0.01 99.49 421994G | 1 0.01 99.50 426247J | 1 0.01 99.51 432020E | 1 0.01 99.52 433791L | 1 0.01 99.53 434224X | 1 0.01 99.54 439820P | 1 0.01 99.55 500637X | 1 0.01 99.56 500734G | 1 0.01 99.57 620900C | 1 0.01 99.58 622954P | 1 0.01 99.59 624354U | 1 0.01 99.60 625276T | 1 0.01 99.61 625397R | 1 0.01 99.62 625732R | 1 0.01 99.63 626870H | 1 0.01 99.64 628167A | 1 0.01 99.65 635797L | 1 0.01 99.66 637906U | 1 0.01 99.67 664077W | 1 0.01 99.68 667469H | 1 0.01 99.69 668077K | 1 0.01 99.70 672543V | 1 0.01 99.71 727862V | 1 0.01 99.72 731870U | 1 0.01 99.73 741668L | 1 0.01 99.74 741795M | 1 0.01 99.75 741802V | 1 0.01 99.76 746047H | 1 0.01 99.77 746891G | 1 0.01 99.78 746896R | 1 0.01 99.79 747397D | 1 0.01 99.80 747420V | 1 0.01 99.81 750098A | 1 0.01 99.82 752746W | 1 0.01 99.83 753036M | 1 0.01 99.84 754942K | 1 0.01 99.85 755147L | 1 0.01 99.86 757089A | 1 0.01 99.87 787759W | 1 0.01 99.88 789010M | 1 0.01 99.89 789040E | 1 0.01 99.90 804375K | 1 0.01 99.91 804493M | 1 0.01 99.92 804536D | 1 0.01 99.93 9999999 | 7 0.07 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016