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
0.03	1
0.04	2
0.05	3
0.05	4
0.06	5
0.07	6
0.08	7
0.09	8
0.10	9
0.10	10
0.12	11
0.13	12
0.14	13
0.16	14
0.17	15
0.19	16
0.20	17
0.22	18
0.23	19
0.25	20
0.26	21
0.28	22
0.30	23
0.32	24
0.34	25
0.35	26
0.37	27
0.39	28
0.41	29
0.43	30
0.45	31
0.47	32
0.49	33
0.51	34
0.53	35
0.55	36
0.57	37
0.59	38
0.61	39
0.64	40
0.67	41
0.68	42
0.71	43
0.73	44
0.75	45
0.78	46
0.80	47
0.82	48
0.85	49
0.88	50
0.90	51
0.93	52
0.96	53
1.00	54
1.02	55
1.05	56
1.08	57
1.11	58
1.14	59
1.17	60
1.21	61
1.25	62
1.29	63
1.33	64
1.37	65
1.41	66
1.45	67
1.50	68
1.55	69
1.60	70
1.65	71
1.70	72
1.75	73
1.81	74
1.88	75
1.94	76
2.01	77
2.08	78
2.15	79
2.23	80
2.31	81
2.39	82
2.48	83
2.59	84
2.69	85
2.81	86
2.93	87
3.06	88
3.20	89
3.35	90
3.53	91
3.72	92
3.93	93
4.18	94
4.48	95
4.89	96
5.37	97
5.97	98
6.91	99
13.55	100