Frequencies for first 10,000 rows of rail variable in accident dataset : Rail Grade | Xing ID | Freq. Percent Cum. ------------+----------------------------------- 0000000 | 9,925 99.25 99.25 0000009 | 4 0.04 99.29 027184F | 1 0.01 99.30 027372V | 1 0.01 99.31 027407U | 1 0.01 99.32 027557C | 1 0.01 99.33 027656A | 1 0.01 99.34 057231T | 1 0.01 99.35 140714A | 1 0.01 99.36 227079M | 1 0.01 99.37 253180Y | 1 0.01 99.38 262451D | 1 0.01 99.39 272476Y | 1 0.01 99.40 272537M | 1 0.01 99.41 306024M | 1 0.01 99.42 341093M | 1 0.01 99.43 351244C | 1 0.01 99.44 425061S | 1 0.01 99.45 425781K | 1 0.01 99.46 431267F | 1 0.01 99.47 433812C | 1 0.01 99.48 433820U | 1 0.01 99.49 433822H | 1 0.01 99.50 434335P | 1 0.01 99.51 434413U | 1 0.01 99.52 434953P | 1 0.01 99.53 437590J | 1 0.01 99.54 437825S | 1 0.01 99.55 438020A | 1 0.01 99.56 438196K | 1 0.01 99.57 500578X | 1 0.01 99.58 500637X | 1 0.01 99.59 504425H | 1 0.01 99.60 593276B | 1 0.01 99.61 600686V | 1 0.01 99.62 621275X | 2 0.02 99.64 624780C | 1 0.01 99.65 639677J | 1 0.01 99.66 668056S | 1 0.01 99.67 668075W | 1 0.01 99.68 668140A | 1 0.01 99.69 726027S | 1 0.01 99.70 726140K | 1 0.01 99.71 726851E | 1 0.01 99.72 727760C | 1 0.01 99.73 728154A | 1 0.01 99.74 731819W | 1 0.01 99.75 741795M | 1 0.01 99.76 746933R | 1 0.01 99.77 749712Y | 1 0.01 99.78 751248J | 1 0.01 99.79 752063F | 1 0.01 99.80 753513D | 1 0.01 99.81 755037B | 2 0.02 99.83 757411Y | 1 0.01 99.84 760730V | 1 0.01 99.85 766042D | 1 0.01 99.86 787350S | 1 0.01 99.87 787712B | 1 0.01 99.88 787830D | 1 0.01 99.89 788982D | 1 0.01 99.90 790823W | 1 0.01 99.91 810885C | 1 0.01 99.92 810977P | 1 0.01 99.93 811350G | 1 0.01 99.94 909151F | 1 0.01 99.95 9999999 | 5 0.05 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016