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
0.18	1
0.30	2
0.44	3
0.57	4
0.68	5
0.78	6
0.87	7
0.96	8
1.04	9
1.11	10
1.19	11
1.27	12
1.33	13
1.40	14
1.47	15
1.54	16
1.60	17
1.66	18
1.73	19
1.79	20
1.84	21
1.90	22
1.96	23
2.02	24
2.08	25
2.14	26
2.19	27
2.26	28
2.32	29
2.38	30
2.45	31
2.51	32
2.57	33
2.63	34
2.70	35
2.76	36
2.82	37
2.89	38
2.95	39
3.01	40
3.07	41
3.13	42
3.20	43
3.26	44
3.33	45
3.38	46
3.45	47
3.51	48
3.58	49
3.64	50
3.71	51
3.78	52
3.87	53
3.94	54
4.01	55
4.09	56
4.16	57
4.23	58
4.30	59
4.37	60
4.44	61
4.52	62
4.60	63
4.68	64
4.78	65
4.86	66
4.95	67
5.05	68
5.14	69
5.23	70
5.32	71
5.42	72
5.52	73
5.62	74
5.72	75
5.84	76
5.99	77
6.13	78
6.26	79
6.40	80
6.54	81
6.70	82
6.86	83
7.05	84
7.24	85
7.43	86
7.61	87
7.80	88
8.03	89
8.26	90
8.53	91
8.83	92
9.15	93
9.64	94
10.09	95
10.64	96
11.47	97
12.59	98
14.17	99
26.34	100