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 003746F | 1 0.01 99.36 025302Y | 1 0.01 99.37 025322K | 1 0.01 99.38 027837E | 1 0.01 99.39 028113M | 1 0.01 99.40 028706E | 1 0.01 99.41 028743G | 1 0.01 99.42 028744N | 1 0.01 99.43 245155V | 1 0.01 99.44 253791N | 1 0.01 99.45 271919E | 1 0.01 99.46 271998T | 1 0.01 99.47 272399H | 1 0.01 99.48 272452k | 1 0.01 99.49 272803G | 1 0.01 99.50 272910w | 1 0.01 99.51 330371V | 1 0.01 99.52 330560S | 1 0.01 99.53 351457M | 1 0.01 99.54 352064h | 1 0.01 99.55 431279A | 1 0.01 99.56 434309A | 1 0.01 99.57 437670C | 1 0.01 99.58 439838A | 1 0.01 99.59 471105J | 1 0.01 99.60 471358S | 1 0.01 99.61 624112Y | 1 0.01 99.62 625704M | 1 0.01 99.63 628126V | 1 0.01 99.64 628502A | 1 0.01 99.65 636532M | 1 0.01 99.66 664076P | 1 0.01 99.67 667192N | 1 0.01 99.68 670581X | 1 0.01 99.69 725427G | 1 0.01 99.70 727355m | 1 0.01 99.71 727598P | 1 0.01 99.72 727681R | 1 0.01 99.73 731975H | 1 0.01 99.74 741343C | 1 0.01 99.75 745641R | 1 0.01 99.76 745663R | 1 0.01 99.77 748911X | 1 0.01 99.78 749772H | 1 0.01 99.79 751224V | 1 0.01 99.80 751292W | 1 0.01 99.81 752855A | 1 0.01 99.82 754870J | 1 0.01 99.83 757245J | 1 0.01 99.84 787595H | 1 0.01 99.85 788027M | 1 0.01 99.86 788994X | 1 0.01 99.87 788994x | 1 0.01 99.88 789140J | 1 0.01 99.89 805397N | 1 0.01 99.90 831207B | 1 0.01 99.91 834919M | 1 0.01 99.92 865227H | 1 0.01 99.93 877481u | 1 0.01 99.94 9999999 | 3 0.03 99.97 999999A | 3 0.03 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016