Frequencies for first 10,000 rows of rail variable in accident dataset : RAIL XING | ID | Freq. Percent Cum. ------------+----------------------------------- 0 | 1 0.01 0.01 0000000 | 9,930 99.30 99.31 003621F | 1 0.01 99.32 026062X | 1 0.01 99.33 028620V | 1 0.01 99.34 028673U | 1 0.01 99.35 028776U | 1 0.01 99.36 029654T | 1 0.01 99.37 057363D | 1 0.01 99.38 253799T | 1 0.01 99.39 272390P | 1 0.01 99.40 279707D | 1 0.01 99.41 330567P | 1 0.01 99.42 339650W | 1 0.01 99.43 339935H | 1 0.01 99.44 339964T | 1 0.01 99.45 351178S | 1 0.01 99.46 369396A | 1 0.01 99.47 421976J | 1 0.01 99.48 426165c | 1 0.01 99.49 4262475 | 1 0.01 99.50 426446L | 1 0.01 99.51 437968P | 1 0.01 99.52 437983S | 1 0.01 99.53 500987P | 1 0.01 99.54 620748V | 1 0.01 99.55 622910P | 1 0.01 99.56 624572B | 1 0.01 99.57 624692S | 1 0.01 99.58 624775F | 1 0.01 99.59 626680E | 1 0.01 99.60 627558R | 1 0.01 99.61 627572L | 1 0.01 99.62 639393E | 1 0.01 99.63 639424B | 1 0.01 99.64 662410S | 1 0.01 99.65 665968S | 1 0.01 99.66 667110E | 1 0.01 99.67 667462K | 1 0.01 99.68 667516N | 1 0.01 99.69 667905U | 1 0.01 99.70 667986W | 1 0.01 99.71 668061N | 1 0.01 99.72 668074P | 1 0.01 99.73 672553B | 1 0.01 99.74 723672D | 1 0.01 99.75 725437M | 1 0.01 99.76 726836C | 1 0.01 99.77 727051W | 1 0.01 99.78 727710Y | 1 0.01 99.79 731837U | 1 0.01 99.80 7423864 | 1 0.01 99.81 745947V | 1 0.01 99.82 746054T | 1 0.01 99.83 746891G | 1 0.01 99.84 746898E | 1 0.01 99.85 746943W | 1 0.01 99.86 750719T | 1 0.01 99.87 750744B | 1 0.01 99.88 751693W | 1 0.01 99.89 753238K | 1 0.01 99.90 755194U | 1 0.01 99.91 787518H | 1 0.01 99.92 789052S | 1 0.01 99.93 845203P | 1 0.01 99.94 9999999 | 6 0.06 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016