Safety Measurement System

Measure vs. Percentile

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. Expand for more information.

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure only considers individual performance based on 24 months of data, with a measure of 0 indicating best performance. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. The graph below shows how the carrier’s measure correlates with its percentile rank over a selected period of time.

Measure

Percentile

Measure	Percentile
0	0
0.04	1
0.04	2
0.05	3
0.06	4
0.07	5
0.08	6
0.09	7
0.10	8
0.11	9
0.12	10
0.13	11
0.14	12
0.16	13
0.17	14
0.19	15
0.20	16
0.22	17
0.23	18
0.25	19
0.26	20
0.28	21
0.29	22
0.31	23
0.32	24
0.34	25
0.36	26
0.38	27
0.39	28
0.41	29
0.43	30
0.45	31
0.47	32
0.48	33
0.51	34
0.52	35
0.54	36
0.56	37
0.58	38
0.60	39
0.63	40
0.65	41
0.67	42
0.69	43
0.72	44
0.74	45
0.76	46
0.78	47
0.81	48
0.84	49
0.86	50
0.89	51
0.92	52
0.95	53
0.97	54
1.01	55
1.03	56
1.06	57
1.09	58
1.12	59
1.16	60
1.19	61
1.23	62
1.26	63
1.31	64
1.35	65
1.39	66
1.43	67
1.47	68
1.52	69
1.57	70
1.62	71
1.67	72
1.72	73
1.76	74
1.82	75
1.88	76
1.95	77
2.02	78
2.09	79
2.17	80
2.25	81
2.34	82
2.42	83
2.51	84
2.61	85
2.71	86
2.83	87
2.95	88
3.08	89
3.22	90
3.38	91
3.55	92
3.72	93
3.91	94
4.18	95
4.51	96
4.85	97
5.37	98
6.24	99
11.67	100