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
0.12	1
0.28	2
0.42	3
0.57	4
0.70	5
0.78	6
0.86	7
0.95	8
1.03	9
1.10	10
1.15	11
1.20	12
1.26	13
1.32	14
1.36	15
1.43	16
1.48	17
1.54	18
1.59	19
1.63	20
1.68	21
1.72	22
1.77	23
1.82	24
1.85	25
1.90	26
1.93	27
1.98	28
2.03	29
2.08	30
2.14	31
2.20	32
2.24	33
2.28	34
2.34	35
2.39	36
2.43	37
2.48	38
2.52	39
2.56	40
2.60	41
2.67	42
2.72	43
2.76	44
2.80	45
2.85	46
2.90	47
2.95	48
3.00	49
3.08	50
3.11	51
3.16	52
3.23	53
3.27	54
3.33	55
3.38	56
3.44	57
3.52	58
3.58	59
3.63	60
3.68	61
3.75	62
3.81	63
3.87	64
3.92	65
3.98	66
4.06	67
4.13	68
4.19	69
4.27	70
4.37	71
4.43	72
4.49	73
4.55	74
4.62	75
4.72	76
4.79	77
4.86	78
4.94	79
5.02	80
5.10	81
5.20	82
5.33	83
5.43	84
5.55	85
5.69	86
5.84	87
5.97	88
6.17	89
6.31	90
6.55	91
6.82	92
7.05	93
7.29	94
7.61	95
8.09	96
8.70	97
9.64	98
12.07	99
18.06	100