Frequencies for first 10,000 rows of rail variable in accident dataset : RAIL XING | ID | Freq. Percent Cum. ------------+----------------------------------- 000000 | 1 0.01 0.01 0000000 | 9,934 99.34 99.35 000000[ | 1 0.01 99.36 003514R | 1 0.01 99.37 026527G | 1 0.01 99.38 027837E | 1 0.01 99.39 028778H | 1 0.01 99.40 271943F | 1 0.01 99.41 272343G | 1 0.01 99.42 272443L | 1 0.01 99.43 304219T | 1 0.01 99.44 330545D | 1 0.01 99.45 351469G | 1 0.01 99.46 421968S | 1 0.01 99.47 425319G | 1 0.01 99.48 425325K | 1 0.01 99.49 425757J | 1 0.01 99.50 425771E | 1 0.01 99.51 426245V | 1 0.01 99.52 438226A | 1 0.01 99.53 438452Y | 1 0.01 99.54 600669E | 1 0.01 99.55 600701V | 1 0.01 99.56 620899K | 1 0.01 99.57 620929A | 1 0.01 99.58 621188U | 1 0.01 99.59 624145A | 1 0.01 99.60 625515R | 1 0.01 99.61 628138P | 1 0.01 99.62 636522G | 1 0.01 99.63 638296S | 1 0.01 99.64 639356A | 1 0.01 99.65 664022J | 1 0.01 99.66 664034D | 1 0.01 99.67 664064V | 1 0.01 99.68 665233J | 1 0.01 99.69 665311N | 1 0.01 99.70 665952A | 1 0.01 99.71 667516N | 2 0.02 99.73 668137S | 1 0.01 99.74 671764U | 1 0.01 99.75 672545J | 1 0.01 99.76 725831P | 1 0.01 99.77 726764B | 1 0.01 99.78 727633B | 1 0.01 99.79 731957K | 1 0.01 99.80 741780X | 1 0.01 99.81 745997Y | 1 0.01 99.82 746052E | 1 0.01 99.83 747717B | 1 0.01 99.84 750604Y | 1 0.01 99.85 752178A | 1 0.01 99.86 755174H | 1 0.01 99.87 756975E | 1 0.01 99.88 757312B | 1 0.01 99.89 787541C | 1 0.01 99.90 789706E | 1 0.01 99.91 789717S | 1 0.01 99.92 833890N | 1 0.01 99.93 911376K | 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