Frequencies for first 10,000 rows of rail variable in accident dataset : RAIL XING | ID | Freq. Percent Cum. ------------+----------------------------------- 0000000 | 9,935 99.35 99.35 003890X | 1 0.01 99.36 027837E | 1 0.01 99.37 028582W | 1 0.01 99.38 028601r | 1 0.01 99.39 028631H | 1 0.01 99.40 028658S | 1 0.01 99.41 028704R | 1 0.01 99.42 028753M | 1 0.01 99.43 028772S | 1 0.01 99.44 140729P | 1 0.01 99.45 245020P | 1 0.01 99.46 271891R | 1 0.01 99.47 272152W | 1 0.01 99.48 272551H | 1 0.01 99.49 272576D | 1 0.01 99.50 330464P | 1 0.01 99.51 339980c | 1 0.01 99.52 351289J | 1 0.01 99.53 352106S | 1 0.01 99.54 352187U | 1 0.01 99.55 425349Y | 1 0.01 99.56 426245V | 1 0.01 99.57 426404A | 1 0.01 99.58 434301V | 1 0.01 99.59 437535J | 1 0.01 99.60 437987U | 1 0.01 99.61 438640N | 1 0.01 99.62 5563302 | 1 0.01 99.63 597701N | 1 0.01 99.64 620634H | 1 0.01 99.65 622851P | 1 0.01 99.66 624309A | 1 0.01 99.67 625050G | 1 0.01 99.68 627512C | 1 0.01 99.69 628102G | 1 0.01 99.70 628138P | 1 0.01 99.71 628159H | 1 0.01 99.72 628343V | 1 0.01 99.73 662048E | 1 0.01 99.74 667897E | 1 0.01 99.75 713526V | 1 0.01 99.76 725391B | 1 0.01 99.77 725424L | 1 0.01 99.78 725835S | 1 0.01 99.79 726749Y | 1 0.01 99.80 726772T | 1 0.01 99.81 731872H | 1 0.01 99.82 741362C | 1 0.01 99.83 746016J | 1 0.01 99.84 747884A | 1 0.01 99.85 749712Y | 1 0.01 99.86 753524r | 1 0.01 99.87 787784E | 1 0.01 99.88 788084T | 1 0.01 99.89 908593G | 1 0.01 99.90 9999999 | 10 0.10 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016