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
0.04	3
0.04	4
0.05	5
0.05	6
0.06	7
0.06	8
0.07	9
0.08	10
0.08	11
0.09	12
0.10	13
0.10	14
0.11	15
0.12	16
0.13	17
0.13	18
0.14	19
0.15	20
0.16	21
0.18	22
0.19	23
0.20	24
0.22	25
0.24	26
0.26	27
0.27	28
0.29	29
0.30	30
0.31	31
0.32	32
0.34	33
0.35	34
0.36	35
0.37	36
0.39	37
0.40	38
0.41	39
0.42	40
0.44	41
0.45	42
0.46	43
0.48	44
0.48	45
0.51	46
0.52	47
0.53	48
0.55	49
0.56	50
0.58	51
0.59	52
0.61	53
0.63	54
0.65	55
0.67	56
0.69	57
0.71	58
0.72	59
0.74	60
0.77	61
0.79	62
0.81	63
0.83	64
0.85	65
0.87	66
0.89	67
0.91	68
0.94	69
0.95	70
1.00	71
1.02	72
1.04	73
1.05	74
1.08	75
1.11	76
1.14	77
1.17	78
1.20	79
1.25	80
1.28	81
1.32	82
1.37	83
1.41	84
1.45	85
1.51	86
1.58	87
1.65	88
1.72	89
1.78	90
1.88	91
1.97	92
2.08	93
2.22	94
2.40	95
2.60	96
2.89	97
3.39	98
4.18	99
14.03	100