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
0.05	4
0.06	5
0.07	6
0.08	7
0.09	8
0.10	9
0.11	10
0.12	11
0.13	12
0.14	13
0.15	14
0.17	15
0.19	16
0.20	17
0.22	18
0.24	19
0.25	20
0.27	21
0.29	22
0.30	23
0.32	24
0.34	25
0.35	26
0.38	27
0.39	28
0.41	29
0.43	30
0.45	31
0.47	32
0.50	33
0.51	34
0.53	35
0.56	36
0.58	37
0.60	38
0.63	39
0.64	40
0.67	41
0.69	42
0.72	43
0.74	44
0.77	45
0.79	46
0.81	47
0.84	48
0.86	49
0.88	50
0.91	51
0.94	52
0.96	53
1.01	54
1.02	55
1.05	56
1.08	57
1.12	58
1.15	59
1.18	60
1.22	61
1.26	62
1.29	63
1.34	64
1.38	65
1.42	66
1.46	67
1.51	68
1.56	69
1.60	70
1.65	71
1.71	72
1.77	73
1.83	74
1.89	75
1.95	76
2.02	77
2.10	78
2.17	79
2.25	80
2.34	81
2.42	82
2.52	83
2.60	84
2.71	85
2.82	86
2.96	87
3.09	88
3.23	89
3.38	90
3.55	91
3.75	92
3.96	93
4.22	94
4.53	95
4.96	96
5.38	97
5.96	98
6.91	99
13.67	100